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A V G 9.0 E mail Server E dition © 201 0 Copyri ght A VG T ec hnologies CZ, s.r.o. A ll rights res erv ed. 1
Document revision 90.4 (9. 3. 2010)
Copyright AVG Technologies CZ, s.r.o. All rights reserved.
All other trademarks are the property of their respective owners.
This product uses RSA Data Security, Inc. MD5 Message-Digest Algorithm, Copyright (C) 1991-2, RSA Data
Security, Inc. C reated 1991.
This product uses code from C-SaCzech library, C opyright (c) 1996-2001 Jaromir Dolecek
(dolecek@ics.muni.cz).
This product uses compression library zlib, C opyright (c) 1995-2002 Jean-loup Gailly and Mark Adler.
AVG 9.0 Email Server Edition
User Manual
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Contents
........................................................................................................................ 4
1. Introduction
........................................................................................................................ 5
2. AVG Installation Requirements
.......................................................................................................... 5
2.1 Operation Systems Supported
.......................................................................................................... 5
2.2 Email Servers Supported
.......................................................................................................... 5
2.3 Hardware Requirements
.......................................................................................................... 6
2.4 Uninstall Previous Versions
.......................................................................................................... 6
2.5 MS Exchange Service Packs
........................................................................................................................ 8
3. AVG Installation Process
.......................................................................................................... 8
3.1 Installation Launch
.......................................................................................................... 9
3.2 License Agreement
.......................................................................................................... 9
3.3 Checking System Status
.......................................................................................................... 10
3.4 Select Installation Type
.......................................................................................................... 10
3.5 Activate AVG
.......................................................................................................... 11
3.6 Custom Installation - Destination Folder
.......................................................................................................... 12
3.7 Custom Installation - Component Selection
.......................................................................................................... 13
3.8 Custom Installation - DataCenter
.......................................................................................................... 14
3.9 Installing
.......................................................................................................... 14
3.10 Installation Completion
........................................................................................................................ 17
4. E-mail Scanner for MS Exchange Server 2007/2010
.......................................................................................................... 17
4.1 Overview
.......................................................................................................... 20
4.2 E-mail Scanner for MS Exc hange (routing TA)
.......................................................................................................... 21
4.3 E-mail Scanner for MS Exc hange (SMTP TA)
.......................................................................................................... 22
4.4 E-mail Scanner for MS Exc hange (VSAPI)
.......................................................................................................... 25
4.5 Detection Actions
.......................................................................................................... 26
4.6 Mail Filtering
........................................................................................................................ 27
5. E-mail Scanner for MS Exchange Server 2000/2003
.......................................................................................................... 27
5.1 Overview
.......................................................................................................... 30
5.2 VSAPI 2.0
.......................................................................................................... 30
5.3 E-mail Scanner for MS Exc hange (VSAPI)
.......................................................................................................... 33
5.4 Detection Actions
.......................................................................................................... 34
5.5 Mail Filtering
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........................................................................................................................ 35
6. AVG for Kerio MailServer
.......................................................................................................... 35
6.1 Configuration
.......................................................................................................... 35
6.1.1 Antivirus
.......................................................................................................... 35
6.1.2 Attachment Filter
........................................................................................................................ 40
7. Anti-Spam Configuration
.......................................................................................................... 40
7.1 Anti-Spam Interface
.......................................................................................................... 42
7.2 Anti-Spam Principles
.......................................................................................................... 42
7.3 Anti-Spam Settings
.......................................................................................................... 42
7.3.1 Anti-Spam Training Wizard
.......................................................................................................... 42
7.3.2 Select Folder with Messages
.......................................................................................................... 42
7.3.3 Message filtering options
.......................................................................................................... 47
7.4 Performance
.......................................................................................................... 48
7.5 RBL
.......................................................................................................... 49
7.6 Whitelist
.......................................................................................................... 50
7.7 Blac klist
.......................................................................................................... 51
7.8 Advanced Settings
........................................................................................................................ 52
8. AVG Settings Manager
........................................................................................................................ 55
9. FAQ and Technical Support
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1. Introduction
This user manual provides comprehensive documentation for AVG 9.0 Email Server
Edition.
Congratulations on your purchase of AVG 9.0 Email Server Edition!
AVG 9.0 Email Server Edition is one of a range of award winning AVG products
designed to provide you with peace of mind and total security for your PC. As with all
AVG products AVG 9.0 Email Server Edition has been completely re-designed, from
the ground up, to deliver AVG’s renowned and accredited security protection in a new,
more user friendly and efficient way.
AVG has been designed and developed to protect your computing and networking
activity. Enjoy the experience of full protection from AVG.
Note: This documentation contains description of specific E-mail Server Edition
features. Should you require information about other AVG features, please consult the
user guide to Internet Security edition, which contains all the necessary details. You
can download the guide from the http://www.avg.com.
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2. AVG Installation Requirements
2.1. Operation Systems Supported
AVG 9.0 Email Server Edition is intended to protect e-mail servers running under the
following operating systems:
· Windows 2008 Server Edition (x86 and x64)
· Windows 2003 Server (x86, x64) SP1
· Windows 2000 Server SP4 + Update Rollup 1
2.2. Email Servers Supported
The following e-mail servers are supported:
· MS Exchange 2000 Server (with Service Pack 1 or higher) version
Note: For Exchange 2000 Server - Service Pack 1 (or higher) needs to be
applied before you can use the AVG engine; AVG for MS Exchange 2000/2003
Server uses the VSAPI 2.0 (or 2.5 with Exchange 2003 Server) application
interface which is covered in this Service Pack.
· MS Exchange 2003 Server version
· MS Exchange 2007 Server version
· MS Exchange 2010 Server version
· AVG for Kerio MailServer – version 6.7.2 and higher
2.3. Hardware Requirements
Minimum hardware requirements for AVG 9.0 Email Server Edition are:
· Intel Pentium CPU 1.5 GHz
· 500 MB of free hard drive space (for installation purposes)
· 512 MB of RAM memory
Recommended hardware requirements for AVG 9.0 Email Server Edition are:
· Intel Pentium CPU 1.8 GHz
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· 600 MB of free hard drive space (for installation purposes)
· 512 MB of RAM memory
2.4. Uninstall Previous Versions
If you have an older version of AVG Email Server installed, you will need to uninstall it
manually before installing AVG 9.0 Email Server Edition. You must manually perform
the uninstallation of the previous version, using the standard windows functionality.
· From the start menu Start/Settings/Control Panel/Add or Remove
Programs select the correct program from the list of installed software. Be
careful to select the correc t AVG program for uninstallation. You need to
uninstall the Email Server Edition before uninstalling the AVG File Server Edition.
· Once you have uninstalled the Email Server Edition, you can proceed to uninstall
your previous version of AVG File Server Edition. This can be done easily from the
start menu Start/All Programs/AVG/Uninstall AVG
· If you have previously used the AVG 8.x or older version, do not forget to
uninstall also individual server plug-ins.
Note: It will be necessary to restart the store service during the uninstallation
process.
Exchange plug-in - run setupes.exe with the /uninstall parameter from the
folder where the plug-in was installed.
e.g. C:\AVG4ES2K\setupes.exe /uninstall
Lotus Domino/Notes plug-in - run setupln.exe with the /uninstall parameter
from folder where the plug-in was installed:
e.g. C:\AVG4LN\setupln.exe /uninstall
2.5. MS Exchange Service Packs
Since AVG for MS Exchange 2000/2003 Server uses the VSAPI 2.0/2.5 virus
scanning interface, you must have the Service Pack 1 (or higher) for MS Exchange
2000 Server applied on your system. Follow the link below to get the latest Service
Pack for MS Exc hange 2000 Server:
Service Pack for MS Exchange 2000 Server:
http://www.microsoft.com/technet/prodtechnol/exchange/downloads/2000/sp3/
default.mspx
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For MS Exchange 2003 Server no additional service pac k is needed; however, it is
recommended to keep your system as up to date with the latest service packs and
hotfixes as possible in order to obtain maximal available sec urity.
Service Pack for MS Exchange 2003 Server (optional):
http://www.microsoft.com/exchange/evaluation/sp2/overview.mspx
At the beginning of the setup, all system libraries versions will be examined. If it is
necessary to install newer libraries, the installer will rename the old ones with a .delete
extension. They will be deleted after the system restart.
Service Pack for MS Exchange 2007 Server (optional):
http://www.microsoft.com/downloads/details.aspx?FamilyID=44c66ad6-f185-4a1da9ab-473c1188954c &displaylang=en
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3. AVG Installation Process
To install AVG on your computer, you need to get the latest installation file. You can
use the installation file from the CD that is a part of your box edition but this file might
be out-of-date. Therefore we rec ommended getting the latest installation file online.
You can download the file from the AVG website (at http://www.avg.com/download?
prd=msw).
During the installation process you will be asked for your license number. Please make
sure you have it available before starting the installation. The sales number c an be
found on the CD packaging. If you purchased your copy of AVG on-line, your license
number will have been delivered to you via e-mail.
Once you have downloaded and saved the installation file on your hard drive, you can
launch the installation process. The installation is a sequence of dialog windows with a
brief description of what do at each step. In the following, we offer an explanation for
each dialog window:
3.1. Installation Launch
The installation process starts with the Welcome window. In here you select the
language used for the installation process. In the lower part of the dialog window find
the Choose your setup language item, and select the desired language from the
drop down menu. Then press the Next button to confirm and continue to the next
dialog.
Attention: You will be able to choose also additional languages for the application
interface later during the installation process.
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3.2. License Agreement
The License Agreement dialog provides the full wording of the AVG license
agreement. Please read it carefully and confirm that you have read, understood and
accept the agreement by checking the I have read license agreement checkbox
and pressing the Accept button. If you do not agree with the license agreement press
the Don't accept button, and the installation process will be terminated immediately.
Use the Printable version button to open the lic ense agreement in a new window
suitable for printing.
3.3. Checking System Status
Having confirmed the license agreement you will be redirec ted to the Checking
System Status dialog. This dialog does not require any intervention; your system is
being chec ked before the AVG installation can start. Please wait until the proc ess has
finished, then continue automatically to the following dialog.
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3.4. Select Installation Type
The Select Installation Type dialog offers the choice of two installation options:
Standard Installation and Custom Installation.
For most users, it is highly recommended to keep to the Standard Installation that
installs AVG in fully automatic mode with settings predefined by the program vendor.
This configuration provides maximum sec urity combined with the optimal use of
resources. In the future, if the need arises to change the configuration, you will
always have the possibility to do so directly in the AVG application.
Custom installation should only be used by experienced users who have a valid
reason to install AVG with non-standard settings. E.g. to fit specific system
requirements.
3.5. Activate AVG
In the Activate your AVG License dialog you have to fill in your registration data.
Type in your name (User Name field) and the name of your organization (Company
Name field).
Then enter your license number into the License Number text field. The license
number will be in the confirmation e-mail that you received after purchasing your AVG
on-line. You must type in the number exactly as shown. If the digital form of the
lic ense number is available (in the email), it is recommended to use the copy and paste
method to insert it.
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Press the Next button to continue the installation process.
If in the previous step you have selected the standard installation, you will be
redirected directly to the Setup Summary dialog. If custom installation was selected
you will continue with the Destination Folder dialog.
3.6. Custom Installation - Destination Folder
The Destination folder dialog allows you to specify the location where AVG should be
installed. By default, AVG will be installed to the program files folder located on drive
C:. If you want to change this location, use the Browse button to display the drive
structure, and select the respec tive folder. Press the Next button to confirm.
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3.7. Custom Installation - Component Selection
The Component Selection dialog displays an overview of all AVG components that
can be installed. If the default settings do not suit you, you can remove/add specific
components.
However, you can only select from components that are included in your
purchased AVG edition. Only those components will be offered to be installed
within the Component Selection dialog!
· Remote Administration component - if you intend to connect AVG to an AVG
DataCenter (AVG Network Editions), then you need to select this option.
Note: Only server c omponents available in the list can be managed remotely!
· AVG Settings Manager - a tool suitable mainly for network administrators that
allows you to copy, edit and distribute AVG configuration. The configuration c an
be saved to a portable devic e (USB flash drive etc.) and then applied manually or
any other way to chosen stations.
· Additional Installed Languages - you can define whic h language(s) AVG
should be installed in. Check the Additional installed languages item and then
select the desired languages from the respective menu.
Basic overview of the individual server components:
· Anti-Spam Server for MS Exchange
Checks all incoming e-mail messages and marks unwanted e-mails as SPAM. It
uses several analyzing methods to process each e-mail message, offering
maximum possible protec tion against unwanted e-mail messages.
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· E-mail Scanner for MS Exchange (routing Transport Agent)
Checks all incoming, outgoing and internal e-mail messages going through the MS
Exchange HUB role.
Available for MS Exchange 2007 and can be installed for HUB role only.
· E-mail Scanner for MS Exchange (SMTP Transport Agent)
Checks all e-mail messages coming through the MS Exchange SMTP interface.
Available for MS Exchange 2007 only and can be installed for both EDGE and HUB
roles.
· E-mail Scanner for MS Exchange (VSAPI)
Checks all e-mail messages stored in user mailboxes. If any viruses are detected,
they are moved to the Virus Vault, or completely removed.
Note: There are different options available for MS Exc hange 2007 and MS Exc hange
2003.
Continue by pressing the Next button.
3.8. Custom Installation - DataCenter
If you selected the Remote Administration Component module during module
selection, then in this screen you can define the connection string for connecting to
your AVG DataCenter.
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3.9. Installing
The Installing dialog shows the progress of the installation process, and does not
require any intervention. Please wait until the installation is complete, then you will be
redirected to the Installation Complete dialog.
3.10. Installation Completion
The First Run Wizard is automatically started during the setup process and will require
few easy steps to fill-in before you can complete the installation:
In the Schedule regular scans and updates dialog set up the interval for new update
files accessibility check-up, and define time when the schedule sc an should be
launched. It is recommended to keep the default values. Press the Next button to
continue.
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In this dialog you decide whether you want to activate the option of anonymous
reporting of exploits and bad sites to AVG virus lab. If so, please mark the I agree to
provide ANONYMOUS information about detected threats to improve my
security option. Press the Finish button to continue.
A new AVG Optimization Scan dialog will appear. The sc anning optimization
functionality searches the Windows and Program files folders where it detects
appropriate files (at the moment those are the *.exe, *.dll and *.sys files) and saves
the information on these files. With the next access these files will not be scanned
again and this reduce the the scanning time significantly.
We recommend to use this option and run the scanning optimization process by
pressing the Optimize scanning now button.
AVG is now installed on your computer and fully functional. The program is running in
the background in fully automatic mode.
To individually setup protec tion for your e-mail server, follow the appropriate chapter:
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· E-mail Scanner for MS Exchange Server 2007/2010
· E-mail Scanner for MS Exchange Server 2000/2003
· AVG for Kerio MailServer
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4. E-mail Scanner for MS Exchange Server 2007/2010
4.1. Overview
The AVG for MS Exchange Server 2007 configuration options are fully integrated within
the AVG 9.0 Email Server Edition as server components.
Basic overview of the individual server components:
· Anti-Spam - Anti-Spam Server for MS Exchange
Checks all incoming e-mail messages and marks unwanted e-mails as SPAM. It
uses several analyzing methods to process each e-mail message, offering
maximum possible protec tion against unwanted e-mail messages.
· EMS (routing) - E-mail Scanner for MS Exchange (routing Transport Agent)
Checks all incoming, outgoing and internal e-mail messages going through the MS
Exchange HUB role.
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Available for MS Exchange 2007 and can be installed for HUB role only.
· EMS (SMTP) - E-mail Scanner for MS Exchange (SMTP Transport Agent)
Checks all e-mail messages coming through the MS Exchange SMTP interface.
Available for MS Exchange 2007 only and can be installed for both EDGE and HUB
roles.
· EMS (VSAPI) - E-mail Scanner for MS Exchange (VSAPI)
Checks all e-mail messages stored in user mailboxes. If any viruses are detected,
they are moved to the Virus Vault, or completely removed.
Double-clic k a required component to open its interface. With the exception of AntiSpam, all the components share the following common c ontrol buttons and links:
· Scan Results
Opens a new dialog where you can review scan results:
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Here you can check messages divided into several tabs acc ording to their
severity. See configuration of individual components for amending the severity
and reporting.
By default there are displayed only results for the last two days. You can change
the displayed period by amending the following options:
o
Show last - insert preferred days and hours.
o
Show selection - choose a c ustom time and date interval.
o
Show all - Displays results for the whole time period.
Use Refresh button to reload the results.
· Refresh statistical values - updates stats displayed above.
· Reset statistical values - resets all the stats to zero.
The working buttons are as follows:
· Settings - use this button to open settings of the component.
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· Back - press this button to return to the Server components overview.
You will find more information on individual settings of all components in the chapters
below.
4.2. E-mail Scanner for MS Exchange (routing TA)
To open the settings of E-mail Scanner for MS Exchange (routing transport agent)
, select the Settings button from the interfac e of the component.
From the Server components list select the E-mail Scanner for MS Exchange
(routing TA) item:
The Basic Settings section contains the following options:
· Enable component - uncheck to disable the whole component.
· Language - select preferred component language.
· Certify messages - check this if you wish to add a certification note to all
scanned messages. You can customize the message in the next field.
The Logging settings section:
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· Log file size - choose a preferred size of the log file. Default value: 100 MB.
The Scanning properties section:
· Use Heuristics - chec k this box to enable heuristic analysis method during
scanning.
· Report Potentially Unwanted Programs and Spyware threats - check this
option to report the presence of potentially unwanted programs and spyware.
· Scan inside archives - check this option to let the sc anner look also inside
archived files (zip, rar, etc.)
The E-mail attachments reporting sec tion allows you to choose which items should
be reported during scanning. If checked, each e-mail with such an item will contain
[INFORMATION] tag in the message subject. This is the default configuration which
can be easily amended in the Detection actions section, part Information (see
below).
The following options are available:
· Report password protected archives
· Report password protected documents
· Report files containing macro
· Report hidden extensions
There are also these sub-items available in the following tree structure:
· Detection actions
· Mail filtering
4.3. E-mail Scanner for MS Exchange (SMTP TA)
The configuration for the E-mail Scanner for MS Exchange (SMTP Transport Agent)
is exactly the same as in the case of routing transport agent. For more information
please see the E-mail Scanner for MS Exchange (routing TA) chapter above.
There are also these sub-items available in the following tree structure:
· Detection actions
· Mail filtering
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4.4. E-mail Scanner for MS Exchange (VSAPI)
This item contains settings of the E-mail Scanner for MS Exchange (VSAPI).
The Basic Settings section contains the following options:
· Enable component - uncheck to disable the whole component.
· Language - select preferred component language.
The Logging settings section:
· Log file size - choose a preferred size of the log file. Default value: 100 MB.
The Scan settings section:
· Background Scan – you c an enable or disable the bac kground scanning process
here. Background scanning is one of the features of the VSAPI 2.0/2.5
applic ation interface. It provides threaded scanning of the Exc hange Messaging
Databases. Whenever an item that has not been sc anned with the latest AVG
virus base update is encountered in the users’ mailbox folders, it is submitted to
AVG for Exchange 2007 Server to be scanned. Scanning and searc hing for the
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not examined objects runs in parallel.
A spec ific low priority thread is used for each database, which guarantees other
tasks (e.g. e-mail messages storage in the Microsoft Exc hange database) are
always carried out preferentially.
· Proactive Scan (incoming messages)
You can enable or disable the proactive scanning function of VSAPI 2.0/2.5 here.
This scanning occurs when an item is delivered to a folder, but a request has not
been made by a client.
As soon as messages are submitted to the Exchange store, they enter the global
scanning queue as low priority (maximum of 30 items). They are scanned on the
first in, first out (FIFO) basis. If an item is accessed while still in the queue, it is
changed to high priority.
Note: Overflow messages will continue to the store unscanned.
Note: Even if you disable both Background Scan and Proactive Scan options, the on
access scanner will be still active when an user will try to download a message with
the MS Outlook client.
· Scan RTF - you can specify here, whether the RTF file type should be scanned
or not.
· Number of Scanning Threads - the scanning process is threaded by default to
increase the overall scanning performance by a certain level of parallelism. You
can change the threads count here.
The default number of threads is computed as 2 times the
‘number_of_processors’ + 1.
The minimum number of threads is c omputed as ('number of processors'+1)
divided by 2.
The maximum number of threads is computed as 'Number of Processors' multiplied
by 5 + 1.
If the value is the minimum or lesser value or the maximum or greater, the
default value is used.
· Scan Timeout - the maximum continuous interval (in seconds) for one thread to
access the message that is being scanned (the default value is 180 seconds).
The Scanning properties section:
· Use Heuristics - chec k this box to enable heuristic analysis method during
scanning.
· Report Potentially Unwanted Programs and Spyware threats - check this
option to report the presence of potentially unwanted programs and spyware.
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· Scan inside archives - check this option to let the sc anner look also inside
archived files (zip, rar, etc.)
The E-mail attachments reporting sec tion allows you to choose which items should
be reported during scanning. The default configuration can be easily amended in the
Detection actions section, part Information (see below).
The following options are available:
· Report password protected archives
· Report password protected documents
· Report files containing macro
· Report hidden extensions
Generally, some of these features are user extensions of the Microsoft VSAPI 2.0/2.5
applic ation interface servic es. For the detailed information on the VSAPI 2.0/2.5 please
refer to the following links (and also the links ac cessible from the referenced ones):
· http://support.microsoft.com/default.aspx?scid=kb;en-
us;328841&Product=exch2k - for information on Exchange and antivirus
software interaction
· http://support.microsoft.com/default.aspx?scid=kb;en-us;823166 for
information on additional VSAPI 2.5 features in Exchange 2003 Server
applic ation.
There are also these sub-items available in the following tree structure:
· Detection actions
· Mail filtering
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4.5. Detection Actions
In the Detection actions sub-item you c an choose automatic actions that should
take place during the scanning proc ess.
The ac tions are available for the following items:
· Infections
· PUP (Potentially Unwanted Programs)
· Warnings
· Information
Use the roll-down menu to choose an action for each item:
· None - no ac tion will be taken.
· Move to Vault - the given threat will be moved to Virus Vault.
· Remove - the given threat will be removed.
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To select a custom subject text for messages that contain the given item/threat,
check the Mark subject with... box and fill-in a preferred value.
Note: The last mentioned feature is not available for E-mail Scanner for MS Exchange
VSAPI.
4.6. Mail Filtering
In the Mail Filtering sub-item you can choose which attachments should be
automatically removed, if any. The following options are available:
· Remove attachments - c heck this box to enable the feature.
· Remove all executable files - removes all executables.
· Remove all documents - removes all document files.
· Remove files with these comma separated extensions - fill the box with file
extensions you wish to automatically remove. Separate the extensions with
comma.
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5. E-mail Scanner for MS Exchange Server 2000/2003
5.1. Overview
The E-mail Scanner for MS Exchange Server 2000/2003 configuration options are fully
integrated within the AVG 9.0 Email Server Edition as a server component.
The server components inc lude the following:
Basic overview of the individual server components:
· Anti-Spam - Anti-Spam Server for MS Exchange
Checks all incoming e-mail messages and marks unwanted e-mails as SPAM. It
uses several analyzing methods to process each e-mail message, offering
maximum possible protec tion against unwanted e-mail messages.
· EMS (VSAPI) - E-mail Scanner for MS Exchange (VSAPI)
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Checks all e-mail messages stored in user mailboxes. If any viruses are detected,
they are moved to the Virus Vault, or completely removed.
Double-clic k a required component to open its interface. With the exception of AntiSpam, all the components share the following common c ontrol buttons and links:
· Scan Results
Opens a new dialog where you can review scan results:
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Here you can check messages divided into several tabs acc ording to their
severity. See configuration of individual components for amending the severity
and reporting.
By default there are displayed only results for the last two days. You can change
the displayed period by amending the following options:
o
Show last - insert preferred days and hours.
o
Show selection - choose a c ustom time and date interval.
o
Show all - Displays results for the whole time period.
Use Refresh button to reload the results.
· Refresh statistical values - updates stats displayed above.
· Reset statistical values - resets all the stats to zero.
The working buttons are as follows:
· Settings - use this button to open settings of the component.
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· Back - press this button to return to the Server components overview.
You will find more information on individual settings of all components in the chapters
below.
5.2. VSAPI 2.0
Virus Scanning API 2.0 (VSAPI 2.0 as provided in MS Exchange 2000 Server) does not
allow the deletion of infected e-mail files. Since the virus infected e-mail message
attachment cannot be deleted, its filename is changed: AVG for Exchange 2000/2003
Server appends the .virusinfo.txt extension to the original filename. The file content is
overwritten with a message about the known virus. If a virus is found directly in the
message, the whole body of the message is overwritten with a note saying a virus was
found inside this message.
Virus Scanning API 2.5 (VSAPI 2.5 as provided in MS Exchange 2003 Server) also
allows deletion of infected messages. This feature can be set up in AVG for MS
Exchange 2000/2003 Server configuration dialog.
5.3. E-mail Scanner for MS Exchange (VSAPI)
This item contains settings of the E-mail Scanner for MS Exchange (VSAPI).
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The Basic Settings section contains the following options:
· Enable component - uncheck to disable the whole component.
· Language - select preferred component language.
The Logging settings section:
· Log file size - choose a preferred size of the log file. Default value: 100 MB.
The Scan settings section:
· Background Scan – you c an enable or disable the bac kground scanning process
here. Background scanning is one of the features of the VSAPI 2.0/2.5
applic ation interface. It provides threaded scanning of the Exc hange Messaging
Databases. Whenever an item that has not been sc anned with the latest AVG
virus base update is encountered in the users’ mailbox folders, it is submitted to
AVG for Exchange 2007 Server to be scanned. Scanning and searc hing for the
not examined objects runs in parallel.
A spec ific low priority thread is used for each database, which guarantees other
tasks (e.g. e-mail messages storage in the Microsoft Exc hange database) are
always carried out preferentially.
· Proactive Scan (incoming messages)
You can enable or disable the proactive scanning function of VSAPI 2.0/2.5 here.
This scanning occurs when an item is delivered to a folder, but a request has not
been made by a client.
As soon as messages are submitted to the Exchange store, they enter the global
scanning queue as low priority (maximum of 30 items). They are scanned on the
first in, first out (FIFO) basis. If an item is accessed while still in the queue, it is
changed to high priority.
Note: Overflow messages will continue to the store unscanned.
Note: Even if you disable both Background Scan and Proactive Scan options, the on
access scanner will be still active when an user will try to download a message with
the MS Outlook client.
· Scan RTF - you can specify here, whether the RTF file type should be scanned
or not.
· Number of Scanning Threads - the scanning process is threaded by default to
increase the overall scanning performance by a certain level of parallelism. You
can change the threads count here.
The default number of threads is computed as 2 times the
‘number_of_processors’ + 1.
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The minimum number of threads is c omputed as ('number of processors'+1)
divided by 2.
The maximum number of threads is computed as 'Number of Processors' multiplied
by 5 + 1.
If the value is the minimum or lesser value or the maximum or greater, the
default value is used.
· Scan Timeout - the maximum continuous interval (in seconds) for one thread to
access the message that is being scanned (the default value is 180 seconds).
The Scanning properties section:
· Use Heuristics - chec k this box to enable heuristic analysis method during
scanning.
· Report Potentially Unwanted Programs and Spyware threats - check this
option to report the presence of potentially unwanted programs and spyware.
· Scan inside archives - check this option to let the sc anner look also inside
archived files (zip, rar, etc.)
The E-mail attachments reporting sec tion allows you to choose which items should
be reported during scanning. The default configuration can be easily amended in the
Detection actions section, part Information (see below).
The following options are available:
· Report password protected archives
· Report password protected documents
· Report files containing macro
· Report hidden extensions
Generally, all these features are user extensions of the Microsoft VSAPI 2.0/2.5
applic ation interface servic es. For the detailed information on the VSAPI 2.0/2.5 please
refer to the following links (and also the links ac cessible from the referenced ones):
· http://support.microsoft.com:80/support/kb/articles/Q285/6/67.ASP for general
info on the VSAPI 2.0 in Exchange 2000 Server Service Pack 1
· http://support.microsoft.com/default.aspx?scid=kb;en-
us;328841&Product=exch2k - for information on Exchange and antivirus software
interaction
· http://support.microsoft.com/default.aspx?scid=kb;en-us;823166 for information
on additional VSAPI 2.5 features in Exchange 2003 Server application.
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There are also these sub-items available in the following tree structure:
· Detection actions
· Mail filtering
5.4. Detection Actions
In the Detection actions sub-item you c an choose automatic actions that should
take place during the scanning proc ess.
The ac tions are available for the following items:
· Infections
· PUP (Potentially Unwanted Programs)
· Warnings
· Information
Use the roll-down menu to choose an action for each item:
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· None - no ac tion will be taken.
· Move to Vault - the given threat will be moved to Virus Vault.
· Remove - the given threat will be removed.
5.5. Mail Filtering
In the Mail Filtering sub-item you can choose which attachments should be
automatically removed, if any. The following options are available:
· Remove attachments - c heck this box to enable the feature.
· Remove all executable files - removes all executables.
· Remove all documents - removes all document files.
· Remove files with these comma separated extensions - fill the box with file
extensions you wish to automatically remove. Separate the extensions with
comma.
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6. AVG for Kerio MailServer
6.1. Configuration
The anti-virus protection mechanism is integrated directly into the Kerio MailServer
applic ation. In order to activate e-mail protection of Kerio MailServer by the AVG
scanning engine, launch the Kerio Administration Console application. In the control
tree on the left side of the applic ation window choose the Content Filter sub-branch in
the Configuration branch:
Clic king the Content Filter item will display a dialog with three items:
· Spam Filter
· Antivirus (see section Antivirus)
· Attachment Filter (see section Attachment Filter)
6.1.1. Antivirus
To activate AVG for Kerio MailServer, select the Use external antivirus checkbox and
choose the AVG Email Server Edition item from the external software menu in the
Antivirus usage frame of the configuration window:
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In the following section you can specify what to do with an infected or filtered
message:
· If a virus is found in a message
This frame specifies the ac tion to be carried out when a virus is detected in a
message, or when a message is filtered by an attac hment filter:
o
Discard the message – when selected, the infec ted or filtered message
will be deleted.
o
Deliver the message with the malicious code removed – when
selected, the message will be delivered to the recipient, but without the
possibly harmful attachment.
o
Forward the original message to administrator address – when
selected, the virus infected message is forwarded to the address specified
in the address text field
o
Forward the filtered message to administrator address - when
selected, the filtered message is forwarded to the address specified in the
address text field
· If a part of message cannot be scanned (e.g. encrypted or corrupted file)
This frame specifies the ac tion to be taken when part of the message or
attachment cannot be scanned:
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o
Deliver the original message with a prepared warning — the message
(or attachment) will be delivered unchec ked. The user will be warned that
the message may still contain viruses.
o
Reject the message as if it was virus — the system will react the same
way as when a virus was detected (i.e. the message will be delivered
without any attac hment or rejected). This option is safe, but sending
password protected archives will be virtually impossible.
6.1.2. Attachment Filter
In the Attachment Filter menu there is a list of various attachment definitions:
You can enable/disable filtering of mail attachments by selecting the Enable
attachment filter checkbox. Optionally you can change the following settings:
· Send a warning to sender that the attachment was not delivered
The sender will receive a warning from Kerio MailServer, that he/she has sent a
message with a virus or blocked attachment.
· Forward the original message to administrator address
The message will be forwarded (as it is — with the infected or forbidden
attachment) to a defined email address, regardless of whether it is a local or an
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external address.
· Forward the filtered message to administrator address
The message without its infected or prohibited attachment will be (apart from
the actions selected below) forwarded to the specified e-mail address. This can
be used to verify the correct functioning of the antivirus and/or attachment
filter.
In the list of extensions, each item has four fields:
· Type – spec ification of the kind of attachment determined by the extension
given in the Content field. Possible types are File name or MIME type. You can
select the respective box in this field to include/exclude the item from
attachment filtering.
· Content – an extension to be filtered can be specified here. You can use
operation system wildcards here (for example the string ‘*.doc .*’ stands for any
file with the .doc extension, and any other extension following).
· Action – define action to be performed with the particular attachment. Possible
actions are Ac cept (accept the attachment), and Bloc k (an action will be
performed as defined above the list of disabled attachments).
· Description – description of the attac hment is defined in this field.
An item is removed from the list by pressing the Remove button. You can add another
item to the list by pressing the Add… button. Or, you can edit an existing record by
pressing the Edit… button. The following window then appears:
· In the Description field you can write a short description of the attachment to be
filtered.
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· In the If a mail message contains an attachment where field you can select the
type of attachment (File name or MIME type). You can also choose a particular
extension from the offered extensions list, or you can type the extension
wildcard directly.
In the Then field you c an dec ide whether to block the defined attachment or accept
it.
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7. Anti-Spam Configuration
7.1. Anti-Spam Interface
You will find the Anti-Spam server component's dialog in the Server Components
section (left menu). It contains a brief information about the functionality of the
server component, information on its current status (Anti-Spam Server for MS
Exchange component is active.), and some statistics.
Available links:
· Scan Results
Opens a new dialog where you can review anti-spam sc an results:
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Here you can check messages detected either as a SPAM (unwanted messages)
or a Phishing attempt (an effort to steal your personal data, banking details,
identity etc.). By default there are displayed only results for the last two days.
You can change the displayed period by amending the following options:
o
Show last - insert preferred days and hours.
o
Show selection - choose a c ustom time and date interval.
o
Show all - Displays results for the whole time period.
Use Refresh button to reload the results.
· Refresh statistical values - updates stats displayed above.
· Reset statistical values - resets all the stats to zero.
The working buttons are as follows:
· Settings - use this button to open Anti- Spam settings.
· Back - press this button to return to the Server components overview.
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7.2. Anti-Spam Principles
Spam refers to unsolicited e-mail, mostly advertising a product or service that is mass
mailed to a huge number of e-mail addresses at a time, filling recipients’ mail boxes.
Spam does not refer to legitimate commercial e-mail for which c onsumers have given
their consent. Spam is not only annoying, but also can often be a source of scams,
viruses or offensive content.
Anti-Spam checks all incoming e-mail messages and marks unwanted e-mails as
SPAM. It uses several analyzing methods to process each e-mail message, offering
maximum possible protec tion against unwanted e-mail messages.
7.3. Anti-Spam Settings
In the Anti-Spam basic settings dialog you c an check the Turn on Anti-Spam
protection checkbox to allow/forbid the anti- spam scanning of e-mail communication.
In this dialog you can also select more or less aggressive scoring measures. The AntiSpam filter assigns each message a score (i.e. how similar the message content is to
SPAM) based on several dynamic scanning techniques. You can adjust the Mark
message as spam if the score is greater or equal to setting by either typing the
value (0 to 100) or by moving the slider left or right (using the slider, the range of
values is limited to 50-90).
Generally we recommended setting the threshold between 50-90, or if you are really
unsure, to 90. Here is a general review of the sc oring threshold:
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· Value 90-99 - Most incoming e-mail messages will be delivered normally (without
being marked as spam). The most easily identified spam will be filtered out, but a
signific ant amount of spam may still be allowed through.
· Value 80-89 - E-mail messages likely to be spam will be filtered out. Some non-
spam messages may be incorrectly filtered as well.
· Value 60-79 - Considered as a quite aggressive configuration. E-mail messages
that are possibly spam will be filtered out. Non-spam messages are likely to be
caught as well.
· Value 1-59 - Very aggressive c onfiguration. Non-spam e-mail messages are as
likely to be c aught as real spam messages. This threshold range is not
recommended for normal use.
· Value 0 - In this mode, you will only receive e-mail messages from senders in
your Whitelist. Any other e-mail messages will be considered as spam. This
threshold range is not recommended for normal use.
You can further define how the detected spam e-mail messages should be treated:
· Modify subject for messages marked as spam - tick this check box if you
would like all messages detected as spam to be marked with a specific word or
character in the e- mail subject field; the desired text can be typed in the
activated text field.
Train Anti-Spam button opens the Anti-Spam training wizard described in details in
the next chapter.
7.3.1. Anti-Spam Training Wizard
The first dialog of the Anti-Spam Training Wizard asks you to select the source of
e-mail messages you want to use for training. Usually, you will want to use either emails that have been incorrectly marked as SPAM, or spam messages that have not
been recognized.
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There are the following options to choose from:
· A specific e-mail client - if you use one of the listed e-mail clients (MS Outlook,
Outlook Express, The Bat!, Mozilla Thunderbird), simply select the respec tive
option
· Folder with EML files - if you use any other e-mail program, you should first
save the messages to a specific folder (in .eml format), or make sure that you
know the location of your e-mail c lient message folders. Then select Folder with
EML files, whic h will enable you to locate the desired folder in the next step
For faster and easier training process, it is a good idea to sort the e-mails in the
folders beforehand, so that the folder you will use for training contains only the
training messages (either wanted, or unwanted). However, it is not necessary, as you
will be able to filter the e-mails later on.
Select the appropriate option and clic k Next to continue the wizard.
7.3.2. Select Folder with Messages
Dialog displayed in this step depends on your previous selection.
Folders with EML files
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In this dialog, please select the folder with the messages you want to use for training.
Press the Add folder button to loc ate the folder with the .eml files (saved e-mail
messages). The selected folder will then be displayed in the dialog.
In the Folders contain drop-down menu, set one of the two options - whether the
selected folder contains wanted (HAM), or unsolicited (SPAM) messages. Please note
that you will be able to filter the messages in the next step, so the folder does not
have to contain only training e-mails. You can also remove unwanted selected folders
from the list by clicking the Remove folder button.
When done, click Next and proceed to Message filtering options.
Specific e-mail client
Once you confirm one of the options, new dialog will appear.
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Note: In case of Microsoft Office Outlook, you will be prompted to select the MS
Office Outlook profile first.
In the Folders contain drop-down menu, set one of the two options - whether the
selected folder contains wanted (HAM), or unsolicited (SPAM) messages. Please note
that you will be able to filter the messages in the next step, so the folder does not
have to contain only training e-mails. A navigation tree of the selected e-mail client is
already displayed in the main section of the dialog. Please locate the desired folder in
the tree and highlight it with your mouse.
When done, click Next and proceed to Message filtering options.
7.3.3. Message filtering options
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In this dialog, you can set filtering of the e-mail messages.
If you are sure that the selected folder c ontains only messages you want to use for
training, selec t the All messages (no filtering) option.
If you are unsure about the messages contained in the folder, and you want the
wizard to ask you about every single message (so that you can determine whether to
use it for training or not), select the Ask for each message option.
For more advanced filtering, select the Use filter option. You can fill in a word (name
), part of a word, or phrase to be searched for in the e-mail subject and/or the
sender's field. All messages matching exactly the entered criteria will be used for the
training, without further prompting.
Attention!: When you fill in both text fields, addresses that match just one of the two
conditions will be used, too!
When the appropriate option has been selected, click Next. The following dialog will be
informative only, telling you that the wizard is ready to process the messages. To
start training, click the Next button again. Training will then start ac cording to
previously selected c onditions.
7.4. Performance
The Engine performance settings dialog (linked to via the Performance item of the
left navigation) offers the Anti-Spam component performance settings. Move the
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slider left or right to change the level of scanning performance ranging between Low
memory / High performance modes.
· Low memory - during the scanning process to identify spam, no rules will be
used. Only training data will be used for identification. This mode is not
recommended for common use, unless the computer hardware is really poor.
· High performance - this mode will consume large amount of memory. During the
scanning process to identify spam, the following features will be used: rules and
spam database cache, basic and advanced rules, spammer IP addresses and
spammer databases.
The Enable on-line checking item is on by default. It results in more precise spam
detection via c ommunication with the Mailshell servers, i.e. the scanned data will be
compared with Mailshell databases online.
Generally it is recommended to keep the default settings and only change them
if you have a valid reason to do so. Any changes to this configuration should
only be done by expert users!
7.5. RBL
The RBL item open an editing dialog called Realtime Blackhole Lists:
In this dialog you can switch on/off the Query RBL servers function.
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The RBL (Realtime Blackhole List) server is a DNS server with an extensive database of
known spam senders. When this feature is switched on, all e- mail messages will be
verified against the RBL server database and marked as spam if identical to any of the
database entries.
The RBL servers databases contain the latest up-to-the-minute spam fingerprints, to
provide the very best and most accurate spam detection. This feature is especially
useful for users who receive large amounts of spam that is not being normally
detected by the Anti-Spam engine.
The RBL servers list allows you to define specific RBL server locations. By default,
two RBL server addresses are specified. We recommend to keep the default settings
unless you are an experienced user and really need to change these settings!
Note: Enabling this feature may, on some systems and configurations, slow down the
e-mail rec eiving process, as every single message must be verified against the RBL
server database.
No personal data is sent to the server!
7.6. Whitelist
The Whitelist item opens a dialog with a global list of approved sender e-mail
addresses and domain names whose messages will never be marked as spam.
In the editing interfac e you can compile a list of senders that you are sure will never
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send you unwanted messages (spam). You can also compile a list of full domain names
(e.g. avg.com), that you know do not generate spam messages.
Once you have such a list of senders and/or domain names prepared, you can enter
them by either of the following methods: by direct entry of each e-mail address or by
importing the whole list of addresses at once. The following control buttons are
available:
· Edit - press this button to open a dialog, where you can manually enter a list of
addresses (you can also use copy and paste). Insert one item (sender, domain
name) per line.
· Import - if you already have a text file of email addresses/domain names
prepared, you can simply import it by selecting this button. The input file must
be in plain text format, and the content must contain only one item (address,
domain name) per line.
· Export - if you decide to export the records for some purpose, you can do so by
pressing this button. All records will be saved to a plain text file.
7.7. Blacklist
The Blacklist item opens a dialog with a global list of blocked sender e-mail addresses
and domain names whose messages will always be marked as spam.
In the editing interfac e you can compile a list of senders that you expect to send you
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unwanted messages (spam). You can also compile a list of full domain names (e.g.
spammingcompany.com), that you expect or receive spam messages from. All e-mail
from the listed addresses/domains will be identified as spam.
Once you have such a list of senders and/or domain names prepared, you can enter
them by either of the following methods: by direct entry of each e-mail address or by
importing the whole list of addresses at once. The following control buttons are
available:
· Edit - press this button to open a dialog, where you can manually enter a list of
addresses (you can also use copy and paste). Insert one item (sender, domain
name) per line.
· Import - if you already have a text file of email addresses/domain names
prepared, you can simply import it by selecting this button. The input file must
be in plain text format, and the content must contain only one item (address,
domain name) per line.
· Export - if you decide to export the records for some purpose, you can do so by
pressing this button. All records will be saved to a plain text file.
7.8. Advanced Settings
Typically it is recommended to keep the default settings and only change them
if you have a valid reason to do so. Any changes to configuration should only be
done by expert users!
If you still believe you need to change the Anti-Spam configuration at the very
advanced level, please follow the instructions provided direc tly in the user interface.
Generally, in each dialog you will find one single specific feature and you can edit it its description is always included in the dialog itself:
· Cache - fingerprint, domain reputation, LegitRepute
· Training - maximum word entries, auto training threshold, weight
· Filtering - language list, country list, approved IPs, blocked IPs, blocked
countries, blocked charsets, spoofed senders
· RBL - RBL servers, multihit, threshold, timeout, maximum IPs
· Internet connection - timeout, proxy server, proxy server authentication
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8. AVG Settings Manager
The AVG Settings Manager is a tool suitable mainly for smaller networks that allows
you to copy, edit and distribute AVG configuration. The configuration can be saved to
a portable device (USB flash drive etc.) and then applied manually to chosen stations.
The tool is included in the installation of AVG and available via Windows Start menu:
All Programs/AVG 9.0/AVG Settings Manager
· Edit AVG configuration of this computer
Use this button to open dialog with advanced settings of your local AVG. All
changes made here will be reflected also to the local AVG installation.
· Load and edit AVG configuration file
If you already have an AVG configuration file (.pck), use this button to open it
for editing. Once you c onfirm your changes by the OK or Apply button, the file
will be replaced with the new settings!
· Apply configuration from file to AVG on this computer
Use this button to open an AVG configuration file (.pck) and apply it to the local
installation of AVG.
· Store local AVG configuration to a file
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Use this button to save the AVG configuration file (.pck) of the local AVG
installation. If you did not set a password for the Allowed actions, you may
experience the following dialog:
Answer Yes if you wish to set the password for access to Allowed items now
and then fill-in the required information and confirm your choice. Answer No to
skip the password creation and continue to save the local AVG configuration to a
file.
· Clone AVG installation
This option allows you to make an exact copy of the local AVG installation by
creating an installation package with c ustom options. To proc eed first select
folder where the installation script will be saved.
Then from the drop-down menu select one of the following:
o
Hidden installation - no information will be displayed during the setup
process.
o
Show installation progress only - the installation will not require any
user attention, but the progress will be fully visible.
o
Show installation wizard - the installation will be visible and user will
need to manually confirm all steps.
Use either the Download button to download the latest available AVG
installation package directly from the AVG website to the selected folder or
manually put the AVG installation package into that folder.
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You can use the Proxy button to define a proxy server settings if your network
requires this for a successful connection.
By clicking OK the cloning process begins and should shortly finish. You may also
experience a dialog asking about setting password to Allowed items (see above).
Once finished, there should be AvgSetup.bat available in the chosen folder
along with other files. If you run the AvgSetup.bat file, it will install AVG
according to the parameters chosen above.
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9. FAQ and Technical Support
Should you have any problems with your AVG, either business or technical, please
refer to the FAQ section of the AVG website at http://www.avg.com.
If you do not succeed in finding help this way, contact the technical support
department by email. Please use the contact form ac cessible from the system menu
via Help / Get help online.
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