If there is another way to go about this, I would be glad to hear it. I have been googling this one piece of the puzzle for most of the day.
I have outsourced spam filtering for a handful of accounts in the domain (I'll use example.com).
Anything coming in for [email protected] gets rewritten to [email protected] in the aliases file. mx2.example.com filters the mail and sends it back to [email protected].
I currently have a procmail script:
:0 f
*^To:.*_filtered@cheshirecat\.net
| /usr/bin/sed -e 's/^To:/s/_filtered//'
This strips the _filtered off of [email protected], so it gets delivered to [email protected]. No muss, no fuss. I was quite proud of myself when I figured out how to implement it.
Alas, that isn't going to fly with Zimbra. This is the last piece before I can migrate (I don't think spamassassin is going to be good enough filtering on its own for these 5 users). I know I could just try it without the external filtering, but if there is a problem I will need a quick implementation solution, so better to figure it out before hand.
Thank you for any suggestions.