I have a number of lists that I administer that seem to have come across
a nasty quirk. I use postfix and spamassassin to keep spam in check but
recently I've noticed something different.
I disallow any posts coming in externally with @my_domain via postfix
(it uses the envelope sender to do the checks). Mailman, on the other
hand, uses the header From: field and thus the problem.
I've recently got mails that looks like this,
From [EMAIL PROTECTED]
Date: blah blah
From: [EMAIL PROTECTED]
so postfix processes it and allows it into my queues (after all it is not
being spoofed - the envelope (first From) is clean). Mailman though sizes
up this email based on the From: header field and denotes it a locally
generate post which I allow irrespective of subscription (I have non-member
filtering to allow posts from '[EMAIL PROTECTED]' through via the
'accept_these_nonmembers' setting).
So I have 2 questions,
1. Anyone know of a decent way to make sure that both the envelope sender
and the noted From header field do in fact match ? else reject/discard
the email.
2. Does mailman allow one to check the envelope sender instead of the
From: header field ? That way I know both postfix and mailman are
looking at the same thing.
I'm using postfix-2.0.16; question-1 above also needs to account for myself
being able to mail out without issue (ie. in case someone suggests header
filtering within postfix -- that would stop internal emails from going out
and I'm unable to upgrade to postfix-2.1 just yet which seems to have hooks
for this now).
Regards,
- Nadim
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