User Guide

Typical deployment scenarios 17
2.3. Installing Kaspersky Anti-Virus
as a filter (single or additional)
Kaspersky Anti-Virus can be installed as either a single filter or together with
other filters. If other mail filters have been installed on your system, you should
carefully define their sequence based on filter settings.
If you are installing Kaspersky Anti-Virus ahead of another filter, note that anti-
virus processing can affect the contents of the email thread: some elements of
email messages (headers, body, etc.) can be changed, notifications generated
by the anti-virus software can be added to the thread, and some messages can
be deleted or rejected for further processing. Therefore, another filter located
behind Kaspersky Anti-Virus will deal with a processed, and therefore altered,
email thread. Consider this factor when configuring filters behind the anti-virus
application. For example, you may exclude notifications generated by Kaspersky
Anti-Virus from filtering.
If you are installing Kaspersky Anti-Virus behind another filter, set the first filter to
forward the email thread to Kaspersky Anti-Virus via a socket.
In this case, Kaspersky Anti-Virus receives the email thread that has been
processed and changed by the first filter.
Configure Milter filters installed on your mail server as follows:
1. Configure Sendmail and Kaspersky Anti-Virus socket options as
described in section 2.1 on page 13.
2. Configure other mail filters installed on your mail server either behind or
ahead of the anti-virus software to transmit the email thread via a
respective socket.
2.4. Installing Kaspersky Anti-Virus
as Milter filter for several
Sendmail servers
Kaspersky Anti-Virus can be used to scan the traffic of several mail servers. This
scenario can provide anti-virus protection for a distributed mail system, but
account must be taken both of the application load caused by several mail
servers, and compliance with licensing conditions. If the license policy is based
on the number of accounts, the Kaspersky Anti-Virus configuration file should
specify the domains of all users whose mail traffic is processed by the protected