On 2022-04-21 at 16:34:38 UTC-0400 (Thu, 21 Apr 2022 16:34:38 -0400)
Ian Evans <dheianev...@gmail.com>
is rumored to have said:
I've seen this a few times with some companies. I'm expecting an email
from, say, example.com
They say it's bouncing. I check the logs and there's a RCPT 450 Sender
address rejected: domain not found. The email is being sent from
email.example.com, but that subdomain doesn't exist, can't be pinged.
This
is a trusted sender, can I somehow whitelist this domain?
Yes.
How exactly you would do that depends on where your existing config has
the 'reject_unknown_sender_domain' restriction. You need a
'check_sender_access' map BEFORE 'reject_unknown_sender_domain' in the
same restriction list, mapping the bogus sender address to PERMIT.
Note that this opens a gap in your restrictions, as the sender address
is trivially easy to set to anything a sender likes, and nothing later
in the same restriction list is checked after a restriction results in a
PERMIT.
--
Bill Cole
b...@scconsult.com or billc...@apache.org
(AKA @grumpybozo and many *@billmail.scconsult.com addresses)
Not Currently Available For Hire
