Download the antivirus components:
yum install clamav-daemon clamav-freshclam clamsmtp
Add the following to the end of your “/etc/postfix/main.cf” file:
content_filter = scan:[127.0.0.1]:10025
Make your “/etc/clamsmtpd.conf” file look like this:
OutAddress: localhost:10026 ClamAddress: /var/run/clamav/clamd.ctl User: clamav
Make your “/etc/clamav/clamd.conf” file look like this:
LogFile /var/log/clamav/clamd.log LogTime yes PidFile /var/run/clamav/clamd.pid LocalSocket /var/run/clamav/clamd.ctl User clamav AllowSupplementaryGroups yes ScanMail yes
At the following to the end of your “/etc/postfix/master.cf” file:
scan unix - - n - 16 smtp
-o smtp_send_xforward_command=yes
-o smtp_enforce_tls=no
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
Restart Postfix and Clam and you should now be able to test it with the test (harmless) virus found here. The test virus can be downloaded and used for testing by adding the virus as an attachment to your email.
/etc/init.d/clamav-daemon restart /etc/init.d/clamsmtp restart /etc/init.d/postfix restart
Don’t forget to occasionally update your virus definitions with the following command. Perhaps add it to your crontab:
freshclam