Procmail, Spamassasin and Postfix integration using Webmin Rumi, November 27, 2008December 7, 2008 The updated post on the same topic available at – https://tweenpath.net/2008/11/a-well-formatted-configs-on-procmail-postfix-spamassassin/ It’s a tedious task- but will try to explain bit by bit… Step-1 Updating Webmin (if you’re running below 1.41 Step-2 add the following to the postifix main.cfg file mailbox_command = /usr/bin/procmail Step-3 Come back to Virtualmin > Features & Plugins and activate Spam Filtering. It will create the procmail necessary updates Step-4 Restart Postfix Step-4 Check if you’re able to receive and send mails Step-5 CHMOD 0666 to /var/log/procmail.log and /home/mail I think this fairly a small trick to setup procmail, spamassasin and postfix! – Configurations (Linux)