Originally Posted by Bigjohn

I figured I'd pop in here and provide a little 'Spam Assassin' micro tutorial.

First, let's have spam asssassin flag messages that it thinks are spam for us.
Find the box that says rewrite-subject.
delete any value in that box, and enter the number 1.

Second, find the box that says subject_tag.
This is where you enter the 'flag' message that will be put at the beginning of any suspected spams subject line. Enter (without the quotes) "**Possible-Spam**" here.

Third, find the box marked required_hits.
Here you enter the minimum score that a message must have to trigger the flagging you just set up above. Mine is set to 4.5, but initially - to prevent a bunch of false positives, I would set it to 5 or 6.