Hi Postfix community,
Does anybody know the original reason of why there is no way to adjust
response code for Alias expansion error (internal loop detected) in
Postfix settings?
Log: unreasonable virtual_alias_maps map nesting for j....@example.com
-- message not accepted, try again later
Response: host outgoing-node-01.example.com[192.0.2.10] said: 451 4.6.0
Alias expansion error (in reply to end of DATA command)
From my understanding this is quite permanent configuration error and
it should result in some 5xx error code instead of 451 one which
hardcoded in set in cleanup of Postfix, as it doesn't going to be
resolved on it's own, it requires fixing of configuration of alias in
database, file or whatever.
I checked docs as well as src code and as far as I see there is no way
to adjust it postfix/postfix/src/cleanup/cleanup_map1n.c at
646ffe205bca7ae89c88e6ef5686706e0ef768f4 · vdukhovni/postfix
<https://github.com/vdukhovni/postfix/blob/646ffe205bca7ae89c88e6ef5686706e0ef768f4/postfix/src/cleanup/cleanup_map1n.c#L129-L139>
More over issue has significantly bigger impact due to nature of how
verify (double-bounce) works - it checks deliverability up to "RCPT
TO:", but alias expansion done only at DATA, so there is no way to not
accept such email. Is there is any reasons why alias expansion not done
at RCPT TO? From my view it's should be done here.
Issue reproduce when you have 2 MTAs when first MTA is incoming MX and
second MTA is outgoing node that doing actual alias expansion and delivery.
Moving alias expansion to first MTA is possible but it still doesn't
solve issue in general, as I don't want to answer to external MTA with
451 soft fail error in this case.
--
Regards,
Dmytro Alieksieiev
DevOps Engineer
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