Clam Antivirus configuration for postfix Mail Server in Debian

Get the correct clam installed

The default clam install are not up to date. Add the following to your /etc/apt/sources.list

deb http://ftp2.de.debian.org/debian-volatile sarge/volatile main

Now Run Update for new packages

#apt-get update

Installing clamav in Debian

#apt-get install clamsmtp clamav-freshclam

 Edit the clamsmtp file

Edit the /etc/clamsmtpd.conf file and change OutAddress: 10025 to OutAddress: 10026. also change Listen:

 127.0.0.1:10026 to Listen: 127.0.0.1:10025

 Edit the postfix files

Add the following to /etc/postfix/main.cf

content_filter = scan:127.0.0.1:10025

receive_override_options = no_address_mappings

Add the following to /etc/postfix/master.cf

 

# AV scan filter (used by content_filter)

scan      unix  -       -       n       -       16      smtp

        -o smtp_send_xforward_command=yes

# For injecting mail back into postfix from the filter

127.0.0.1:10026 inet  n -       n       -       16      smtpd

        -o content_filter=

        -o receive_override_options=no_unknown_recipient_checks,no_header_body_checks

        -o smtpd_helo_restrictions=

        -o smtpd_client_restrictions=

        -o smtpd_sender_restrictions=

        -o smtpd_recipient_restrictions=permit_mynetworks,reject

        -o mynetworks_style=host

        -o smtpd_authorized_xforward_hosts=127.0.0.0/8

Final step

Restart postfix and clamsmtp using the below commands. Follow the mail.log and check for errors

#/etc/init.d/postfix restart

#/etc/init.d/clamsmtp restart