From: Josh Marcus (no email)
Date: Thu Jul 01 2004 - 13:56:03 EDT
I was wondering if I could get advice on an issue I'm having.
Very occasionally, on a system I administrate, I'm getting unknown user
errors for incoming mail which should be accepted. My best guess is
that this happening because of a less than ideal authentication scheme.
Flat /etc/passwd and shadow files are generated from a MySQL database,
and then copied into place after verification. My guess is that, under
high load, there is a moment where postfix is checking a user while the
file is being copied into place.
I was wondering if anyone had any advice. I am considering switching
over to postfix, or trying to figure out how to setup pam to check a
mysql database and fallback to /etc/passwd if that fails. Is there a
way to setup postfix itself to use a particular authenticaiton scheme?
Is there a simple quick fix to work around this problem temporarily?
Or has anyone seen any other problematic system setup that might lead to
this symptom?
--j
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