I've run into a problem with local mail filtering getting bypassed
sporadically. This is with courier 0.50.1.
I'm running my own rcptfilter local filter (instead of maildrop) and
it's working well. But about once a day a message comes through that
courier simply delivers without calling the rcptfilter. I know this
because spam was leaking through that should have been caught by the
filter, so I started logging every call to the filter. And this
sporadic "leaker" is the one and only time I don't get a log entry
from my filter. BTW, the message is always to a local account, always
from an external IP and email ID and there doesn't seem to be
anything unusual about the envelope.
It appears that this only happens when two esmtpd connections come in
together and one message is bounced by courier (RBL, DNS error, bad
MX). The one message is bounced and the other message skips passing
through the local filter. I looked at the code and I can't see any
relationship there, so it may be a coincidence. (Likely -- it's a
fairly busy mail server.)
Any thoughts on how I can track this down?
--
Bill Schindler
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