Exim 4 and ClamAV Malware Scanning in Ubuntu

*[MTA]: Mail Transfer Agent
Although virus scanners are installed on virtually all regular client systems nowadays, it's nice to have the mailserver pre-scanning mails for malware. This article describes the configuration of ClamAV in conjunction with Exim 4 in Ubuntu Linux.

Assuming a working Exim 4 environment, the fist step is to install the necessary ClamAV package:

aptitude install clamav-daemon

To tell Exim which anti-virus scanner to use, the file /etc/exim4/exim4.conf.template needs to be customized. The default config already brings the necessary lines. They just need to be adjusted and uncommented:

av_scanner = clamd:/var/run/clamav/clamd.ctl
  malware = *
  message = This message was detected as possible malware ($malware_name).
  message = X-Virus-Scanned: (${readsocket{/var/run/clamav/clamd.ctl}{VERSION}{2s}{}{AV Not running}})

In order for ClamAV to access the mail spool it has to become a member of Exim's group:

usermod -a -G Debian-exim clamav && service clamav-daemon restart

Now, sending a testmail like the one from EICAR should give you the appropriate malware rejection.

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