A V G Email Server E dition 2 0 11 © 201 0 Copyri ght A VG T ec hnologies CZ, s.r.o. A ll rights res erv ed. 1
Document revision 2011.01 (22. 9. 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 Email Server Edition 2011
User Manual
A V G Email Server E dition 2 0 11 © 201 0 Copyri ght A VG T ec hnologies CZ, s.r.o. A ll rights res erv ed. 2
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
.......................................................................................................... 5
2.4 Uninstall Previous Versions
.......................................................................................................... 6
2.5 MS Exchange Service Packs
........................................................................................................................ 7
3. AVG Installation Process
.......................................................................................................... 7
3.1 Installation Launch
.......................................................................................................... 8
3.2 Activate Your License
.......................................................................................................... 9
3.3 Select Installation Type
.......................................................................................................... 10
3.4 Custom Install - Custom Options
.......................................................................................................... 11
3.5 Installation Completion
........................................................................................................................ 13
4. E-mail Scanner for MS Exchange Server 2007/2010
.......................................................................................................... 13
4.1 Overview
.......................................................................................................... 16
4.2 E-mail Scanner for MS Exc hange (routing TA)
.......................................................................................................... 17
4.3 E-mail Scanner for MS Exc hange (SMTP TA)
.......................................................................................................... 18
4.4 E-mail Scanner for MS Exc hange (VSAPI)
.......................................................................................................... 20
4.5 Technical Notice
.......................................................................................................... 22
4.6 Detection Actions
.......................................................................................................... 23
4.7 Mail Filtering
........................................................................................................................ 24
5. E-mail Scanner for MS Exchange Server 2003
.......................................................................................................... 24
5.1 Overview
.......................................................................................................... 27
5.2 E-mail Scanner for MS Exc hange (VSAPI)
.......................................................................................................... 30
5.3 Detection Actions
.......................................................................................................... 31
5.4 Mail Filtering
........................................................................................................................ 32
6. AVG for Kerio MailServer
.......................................................................................................... 32
6.1 Configuration
.......................................................................................................... 32
6.1.1 Antivirus
.......................................................................................................... 32
6.1.2 Attachment Filter
........................................................................................................................ 37
7. Anti-Spam Configuration
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.......................................................................................................... 37
7.1 Anti-Spam Interface
.......................................................................................................... 39
7.2 Anti-Spam Principles
.......................................................................................................... 39
7.3 Anti-Spam Settings
.......................................................................................................... 39
7.3.1 Anti-Spam Training Wizard
.......................................................................................................... 39
7.3.2 Select Folder with Messages
.......................................................................................................... 39
7.3.3 Message filtering options
.......................................................................................................... 44
7.4 Performance
.......................................................................................................... 46
7.5 RBL
.......................................................................................................... 47
7.6 Whitelist
.......................................................................................................... 48
7.7 Blac klist
.......................................................................................................... 49
7.8 Advanced Settings
........................................................................................................................ 50
8. AVG Settings Manager
........................................................................................................................ 53
9. FAQ and Technical Support
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1. Introduction
This user manual provides comprehensive documentation for AVG Email Server
Edition 2011.
Congratulations on your purchase of AVG Email Server Edition 2011!
AVG Email Server Edition 2011 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 Email Server Edition 2011 has been c ompletely 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 Email Server Edition 2011 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
2.2. Email Servers Supported
The following e-mail servers are supported:
· 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 Email Server Edition 2011 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 Email Server Edition 2011 are:
· Intel Pentium CPU 1.8 GHz
· 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 Email Server Edition 2011. 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
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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
There is no servic e pac k required for MS Exchange 2003 Server; 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)
Note: There are two installation packages available for your product - for 32bit
operating systems (marked as x86) and for 64bit operating systems (marked as x64).
Be sure to use the correct installation package for your spec ific operating system..
During the installation process you will be asked for your license number. Please make
sure you have it available before starting the installation. The number can be found in
the CD pac kaging. If you purc hased 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 and read the license conditions. Use the
Printable version button to open the license text in a new window. Press the Accept
button to confirm and continue to the next dialog.
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Attention: You will be able to choose also additional languages for the application
interface later during the installation process.
3.2. Activate Your License
In the Activate your License dialog you have to fill in your license number.
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 license number is
available (in the email), it is recommended to use the copy and paste method to insert
it.
Press the Next button to continue the installation process.
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3.3. Select Installation Type
The Select type of Installation dialog offers the choice of two installation options:
Quick Install and Custom Install.
For most users, it is highly recommended to keep to the Quick Install 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 resourc es.
In the future, if the need arises to c hange the configuration, you will always have the
possibility to do so directly in the AVG applic ation.
Custom Install 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.
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3.4. Custom Install - Custom Options
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.
The Component selection section 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!
· AVG Remote Admin Client - 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!
· Settings Manager - a tool suitable mainly for network administrators 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 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 (Server Addins):
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· 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.
· 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 2007/2010 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 2007/2010 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 different versions of MS Exchange.
Continue by pressing the Next button.
3.5. Installation Completion
If you selected the Remote Administration Component module during module
selection, then the final screen will allow you to define the connection string for
connecting to your AVG DataCenter.
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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:
· E-mail Scanner for MS Exchange Server 2007/2010
· E-mail Scanner for MS Exchange Server 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 2007/2010 c onfiguration options are fully integrated
within the AVG Email Server Edition 2011 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.
Available for MS Exchange 2007/2010 and can be installed for HUB role only.
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· 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 2007/2010 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.
Important note: If you decided to install and use VSAPI in combination with routing
Transport agent on a Hub Exchange role, your e-mail messages will be scanned twic e.
To avoid this, please review the Technical notice chapter below for more details.
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.
· Back - press this button to return to the Server components overview.
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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:
· 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
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scanning.
· Report Potentially Unwanted Programs and Spyware threats - check this
option to report the presence of potentially unwanted programs and spyware.
· Report enhanced set of Potentially Unwanted Programs - check to detect
extended package of spyware: programs that are perfec tly ok and harmless
when ac quired from the manufacturer directly, but can be misused for malicious
purposes later, or programs that always harmless but might be unwanted
(various toolbars etc.). This is an additional measure that increases your
computer security and comfort even more, however it can possibly block legal
programs, and is therefore switched off by default. Note: This detection feature
is additional to the previous option, so if you want protection from the basic
types of spyware, always keep the previous box checked.
· 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 Server to be scanned. Scanning and searching for the not
examined objects runs in parallel.
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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.
· Report enhanced set of Potentially Unwanted Programs - check to detect
extended package of spyware: programs that are perfec tly ok and harmless
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when ac quired from the manufacturer directly, but can be misused for malicious
purposes later, or programs that always harmless but might be unwanted
(various toolbars etc.). This is an additional measure that increases your
computer security and comfort even more, however it can possibly block legal
programs, and is therefore switched off by default. Note: This detection feature
is additional to the previous option, so if you want protection from the basic
types of spyware, always keep the previous box checked.
· 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
4.5. Technical Notice
This information relates to situation when you install and use both VSAPI and routing
Transport Agent on a Hub Exchange role. In such case, your e-mail messages will be
scanned twic e (first by the VSAPI on-ac cess sc anner and then by the routing
Transport Agent).
Due to the way the VSAPI interface works, there might occur some inconsistencies in
scanning results as well as unnecessary load. Therefore, to avoid duplicated scanning,
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we rec ommend a small fix (see below) to resolve this issue instantly.
Note: Adjusting registry is advised only to experienced users. We recommend that
before you edit the registry, you back up the registry and understand how to restore
it if a problem occurs.
Open the Registry editor (Windows menu Start/Run, type in regedit and press
enter). Navigate to the following branch:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeIS\Vi
rusScan
Right-click in the right part of the window and from the c ontext menu select New/
DWORD (32-bit) value. Name the new value TransportExclusion. Double click it
once created and change its value to 1.
And finally, to apply the change to the MS Exchange server, you need to set
ReloadNow value to 1. Do so by double clicking it and changing its value.
This way you will disable the outgoing scanning by VSAPI On-access scanner. The
change should be active within a few minutes.
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4.6. 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.
4.7. 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 2003
5.1. Overview
The E-mail Scanner for MS Exchange Server 2003 configuration options are fully
integrated within the AVG Email Server Edition 2011 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)
Checks all e-mail messages stored in user mailboxes. If any viruses are detected,
they are moved to the Virus Vault, or completely removed.
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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.
· Back - press this button to return to the Server components overview.
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You will find more information on individual settings of all components in the chapters
below.
5.2. 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
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virus base update is encountered in the users’ mailbox folders, it is submitted to
AVG for Exchange Server to be scanned. Scanning and searching 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.
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
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option to report the presence of potentially unwanted programs and spyware.
· Report enhanced set of Potentially Unwanted Programs - check to detect
extended package of spyware: programs that are perfec tly ok and harmless
when ac quired from the manufacturer directly, but can be misused for malicious
purposes later, or programs that always harmless but might be unwanted
(various toolbars etc.). This is an additional measure that increases your
computer security and comfort even more, however it can possibly block legal
programs, and is therefore switched off by default. Note: This detection feature
is additional to the previous option, so if you want protection from the basic
types of spyware, always keep the previous box checked.
· 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/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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5.3. 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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5.4. 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:
o
Deliver the original message with a prepared warning — the message
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(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
external address.
· Forward the filtered message to administrator address
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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.
· 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.
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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 (50 to 90) or by moving the slider left or right.
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Here is a general review of the sc oring threshold:
· Value 90 - 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 50-59 - Very aggressive configuration. 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.
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.
· Ask before reporting wrong detection - provided that during the installation
process you agreed to participate in the Product Improvement Programme - this
programme helps us to collect up-to-date information on the latest threats from
all participants worldwide, and in return we can improve protection for everyone
- i.e. you allowed reporting of detec ted threats to AVG. The reporting is taken
care of automatically. However, you may mark this check box to c onfirm you
want to be asked before any detected spam gets reported to AVG to make sure
the message should really be classified as spam.
Note: This option is not applic able for AVG Email Server Edition 2011.
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
In this dialog, you can set filtering of the e-mail messages.
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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
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left navigation) offers the Anti-Spam component performance settings. Move the
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!
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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.
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.
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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
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 - you can import your existing e-mail addresses by selecting this button.
The input file c an be a text file (in plain text format, and the content must
contain only one item - address, domain name - per line), WAB file or the import
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can be done from Windows Address Book or Microsoft Office Outlook.
· 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
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.
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· Import - you can import your existing e-mail addresses by selecting this button.
The input file c an be a text file (in plain text format, and the content must
contain only one item - address, domain name - per line), WAB file or the import
can be done from Windows Address Book or Microsoft Office Outlook.
· 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 2011/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
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:
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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.
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
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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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