Spamassassin+postfix+procmail mini howto

Get spamassassin installed, the docs on their site are good enough,
just install it via CPAN

get spamd running

Make sure /usr/bin/procmail is still suid root. I recommend upgrading
to the latest version available.

In your postfix config put:
mailbox_command = /usr/bin/procmail

Add an alias, root->youruser, if you havn't already(BAD! *SLAP*)

Restart postfix. Make sure mail is still deliverable.

In /etc/procmailrc put:
:0fw
| /usr/bin/spamc


Optionaly, if you have users that are not capible of editing their .procmailrc
or setting up header-based filters in their MUA, you can add:

:0:
* ^X-Spam-Status: Yes
/dev/null

To send anything SA thinks is spam to /dev/null. I do not recommend this.

Make sure mail is still deliverable. Read the headers, it should
now have an X-Spam-Status: header in there somewhere.

That's it.