MailScanner SPAM Forward & Postfix Problem
drew at THEMARSHALLS.CO.UK
Thu Apr 7 16:44:42 IST 2005
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Kennedy Clark said:
> I installed MailScanner/SpamAssassin/ClamAV last week. I used Johnny
Hughes' excellent guide at
> http://www.hughesjr.com/content/category/1/14/30/Guides (see Part 4).
> I'm using RHEL 3/CentOS 3.4. On the MTA side, I am using Postfix with a
virtual alias table. I want to have MailScanner use the "forward" "Spam
Actions" option to put all spam in a central email account (it's a local
account on the same server). I can email to this central spam account
no problem (both locally and from outside accounts such as gmail). The
"Spam Actions = forward blah at blah.com" works if
> blah at blah.com is an account on a separate system (such as this account
on gmail). However, no matter what I do, I cannot make it work with a
local account -- I always get the following postfix error in
> ..., status=bounced (user unknown in virtual alias table).
> I'm guessing it has something to do with the fact that I'm using a
virtual alias table, but I don't want to get rid of that (even for
testing purposes) because it's obviously being used for live email. :-)
This is a Postfix err, 'feature'. Because of the way that Postfix and
MailScanner work, you can't forward spam to a virtual user.
The why: Postfix uses the cleanup agent to do the virtual aliasing,
unfortunately this happens _before_ MailScanner sees the message. So when
you re-inject a spam message to a virtual user, it's after Postfix would
have alised it to it's real destination, hence the bounce.
The solution: Forward spam to a local account that is alised to your
virual user e.g. forward spam to localuser at box.domain.tld then in the
aliases table put localuser: virtual at virtual.tld and then $newaliases
That will then do the job for you.
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