I’m using Spamassassin to fight spam on my mail server. All incoming spam is marked with [***** SPAM spamscore *****]. This is all good, but when you get a couple of hundred spam mails every day it gets annoying to sort them manually. This can be done automatically with procmail.

DEFAULT=$HOME/Maildir/
MAILDIR=$HOME/Maildir/

:0: 
* ^X-Spam-Status: Yes
.Spam/

This is my procmail configuration. It’s located in a file called .procmailrc in my home folder. It checks all incoming mail for the X-Spam-Status and if it’s marked as spam it’s moved to the maildir folder called .Spam in ~/Maildir (trailing slashes are important, they tell procmail I’m using maildir instead of mbox).

Now, there’s one last configuration needed. You have to tell postfix to use procmail. Add the following line to /etc/postfix/main.cf

mailbox_command = /usr/bin/procmail -f- -a "$USER"

Make sure there’s a maildir folder called .Spam in ~/Maildir, if not the spam mail won’t be saved and it will be lost. But hey, maybe that isn’t so bad? I want to save it to make sure I don’t lose any important stuff that’s marked as spam by mistake.