Bi-Directional Email Message Scanning In Mta; Scanning Of Inbound Email Messages; Scanning Of Outbound Email Messages; Scanning Of Email Messages Downloaded From Pop3/Imap Server - ESET MAIL SECURITY - FOR LINUX BSD AND SOLARIS Installation Manual

The remainder of this chapter reviews methods for integrating ESETS with a variety of supported messaging
systems.

5.1 Bi-directional email message scanning in MTA

Bi-directional email message scanning mode allows the user to scan inbound email messages as well as outbound,
using the same implementation algorithm. The bi-directional content filter method is MTA dependent. ESET Mail
Security comes with five content filters that are built for the most common MTA programs, such as MTA Sendmail,
Postfix, Exim, QMail and ZMailer.
Check that your MTA is properly configured and running. Then, configure ESET Mail Security for bi-directional email
message scanning by running the following script:
/usr/sbin/esets_setup
Select MTA and content filter install options. The ESETS module being used is also displayed.
Note that the installer backs up all modified configuration files and can display every command that it will execute
after your approval. It can also be used for uninstalling. Detailed steps for all possible scenarios are described in
appendix A of this documentation.

5.2 Scanning of inbound email messages

Inbound email message scanning is performed during message transfer between MTA and MDA. Incoming emails
are intercepted by the esets_mda module, scanned by the ESETS daemon and delivered to MAILBOX using the original
MDA. As shown in figure 5-1, virus scanning can be enabled by setting the proper configuration of MTA and the
esets_mda module. ESET Mail Security supports most common MTA programs, such as MTA Sendmail, Postfix, Exim,
QMail and ZMailer. ESETS supports any MDA. In particular, the following MDAs were tested: procmail, maildrop,
deliver and local.mail.
Check that your MTA is properly configured using the original MDA and that the MTA is running. Then configure
ESET Mail Security for inbound email message scanning by running the following script:
/usr/sbin/esets_setup
Select MDA and inbound install options. The ESETS module used is also displayed.
Note that the installer backs up all modified configuration files and can display every command that it will execute
after your approval. Also use it for uninstall. Detailed steps for all possible scenarios are described in the appendix A of
this documentation.

5.3 Scanning of outbound email messages

Outbound email message scanning is performed during transfer of email messages between the local MUA and the
MTA.
Configure ESET Mail Security for outbound email message scanning by running the following script:
/usr/sbin/esets_setup
Select the SMTP install option. This will set the esets_smtp module to listen on a predefined port and redirect
applicable IP packets. Check the newly added firewall rule to see if any changes are necessary.
Note that the installer backs up all modified configuration files and can display every command that it will execute
after your approval. It can also be used for uninstalling. Detailed steps for all possible scenarios are described in
appendix A of this documentation.

5.4 Scanning of email messages downloaded from POP3/IMAP server

POP3/IMAP messages scanning is performed during message transfer between MAILBOX and MUA. All emails
requested by POP3/IMAP clients are intercepted by the esets_pop3 (or esets_imap) agent module and scanned by the
ESETS daemon for infiltrations. ESET Mail Security supports most common MUA programs, such as MS Outlook,
Evolution, Mozilla Thunderbird and others. Note that there is restriction in ESET Mail Security functionality when
emails downloaded by Mozilla Thunderbird using IMAP communication protocol. An email in this case is requested
and downloaded part by part and built directly by Mozilla Thunderbird. For this reason it is not possible to write
proper information about the infiltrations found into the header and body of the email and thus the functionality is
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