--On Friday, January 16, 2009 7:01 AM -0500 Wietse Venema
<wie...@porcupine.org> wrote:
Quanah Gibson-Mount:
We have a milter that examines emails and adds headers if it believes
they are spam. However, it looks like 33% of the time, the headers
that we've added to the email are stripped out by postfix before
delivery, which ends up causing a lot of spam to get delivered. We've
snooped the connection between postfix and the milter to verify that it
is actually returning the spam headers:
If you use any software other than Postfix >= 2.3 to touch the
queue files, then you lose the headers that the Milter has added.
We use postfix to accept and deliver the email, and have the email run
through the milter and amavisd for delivery. So, I think the answer here
is no, we don't.
To debug:
- Use the Postfix HOLD action (access map, header/body_checks) to
freeze the mail in the queue.
- Then inspect the message (postcat -q queueid | less).
- Release the message with "postsuper -H queueid".
Repeat above procedure for each iteration of mail through a Postfix
MTA instance.
Use tcpdump to watch mail before and after Postfix.
Thanks, will give this a shot.
--Quanah
--
Quanah Gibson-Mount
Principal Software Engineer
Zimbra, Inc
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