[courier-users] Question on backscatter prevention,

I run a little mail server at home for family / friends. I currently am
running 0.52.2, which I recognize is not current - and am planning to
upgrade soon. I am running a single domain, virtual accounts (ldap), not a
lot of bells and whistles. I do have spamassasin filtering all mail using
a global maildroprc instruction. Generally everything runs great - I've
been running this setup for a couple of years and it is very stable and
reliable.

Ok, the problem: I occasionally have accounts that start rejecting mail
with "456 Address temporarily unavailable" errors. Sometimes this clears
up on its own, sometimes I get inpatient and "courier clear" the problem.
I understand that this is backscatter prevention, yada yada.

So - what I want to know is this: how can I determine WHY courier felt
that it could not deliver to this local account in the first place? I
don't see anything in the logs that indicates any delivery problems right
before the account gets blacklisted. I do have problems with spamassasin /
clamav filtering running long sometimes - could this be the cause? How do
I find out?

Thanks!
Matt


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