Migrating from postfix, one hurdle left - Need to rewrite 'To:' before local delivery

[danielj]

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 user@example.com gets rewritten to user@mx2.example.com in the aliases file. mx2.example.com filters the mail and sends it back to user_filtered@example.com.

I currently have a procmail script:
<code>
:0 f
*^To:.*_filtered@cheshirecat\.net
| /usr/bin/sed -e 's/^To:/s/_filtered//'
</code>

This strips the _filtered off of user_filtered@example.com, so it gets delivered to user@example.com. 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.

[phoenix]

Anything coming in for user@example.com gets rewritten to user@mx2.example.com in the aliases file. mx2.example.com filters the mail and sends it back to user_filtered@example.com.

Why are you actually using a domain name of mx2.example.com rather than example.com on your Zimbra server?

[danielj]

I'm not. I didn't think the actual domain name was relevant to the question.

[phoenix]

I'm not. I didn't think the actual domain name was relevant to the question.

You posted two example and one of them is using an FQDN or a sub-domain name (mx2.example.com) and the other a domain name (example.com), is that not correct? It's not the actual domain name that's important it's the fact you're showing two different formats for them in your example.

[danielj]

Mail comes in to user@example.com on the example.com mail server. The mail server forwards that email to the mail server at mx2.example.com, which is just a CNAME for our outsourced mail server. That outsourced server filters the mail and sends it back to example.com as user_filtered@example.com.

Is it clearer that way? I realize this is an unusual scenario.

Thanks.

[uxbod]

Why not add an alias to the accounts ?