User Guide

18 Kaspersky
®
SMTP-Gateway 5.5 for Linux/Unix
• Specify the list of all corporate local domains as a value for the
ProtectedDomains option in the [smtpgw.network] section of the
application configuration file ("*" and "?" wildcards can be used). Mail
messages for the specified domains will be scanned.
2.3.2. Installing the application inside your
mail system
If the application is installed inside your mail system, there is no access from
outside to the information about the application running on the server and its
configuration. Besides, if the application is installed inside the mail system on a
dedicated server, this provides for the possibility to distribute the load among
several servers performing anti-virus scanning.
The following algorithm is provided for joint operation of the application and the
mail system installed on the same server:
1. Duplicate your mail system and configure one of the copies to listen
on port 25 and receive email messages via all available interfaces.
2. This mail system forwards all incoming messages through the local
interface via a different port (port 1025, for instance) to the
application for anti-virus scanning.
3. The application scans the email messages for viruses and forwards
scanned and processed messages to the second mail system
copy, which receives mail on a different port (e.g., port 1026).
4. The second mail system delivers email to the local users.
Application setup on a dedicated server is similar to the above procedure.
Besides, when installing the application on a dedicated server, you can create
and run several copies of the application on different servers. This can help you
distribute the anti-virus processing load among several servers.
To implement this scenario of application deployment, specify the list of all
corporate local domains as a value for the ProtectedDomains option in the
[smtpgw.network] section of the application configuration file ("*" and "?"
wildcards can be used). Mail messages for the specified domains will be
scanned.
This deployment scenario is the most convenient one, especially if the
installation of Kaspersky SMTP-Gateway is performed at the same time
with the deployment of the network and of the company’s mail system.
This deployment scenario is recommended if you are sure of the
reliability of your mail system. The installation of the application will not
affect the stability of your mail system.