On Tue 28/Jan/2025 18:49:01 +0100 Fehlauer, Norbert wrote:
Hi,
Thanks. So, if a domain has correct defined mx records only those can be used
and if they are not reachable for any reason there should never be an attempt
to reach the implicit MX RR of the domain.
Correct.
The reason I'm asking is I got NDRs from external senders (a few days apart
from each other) which tried to deliver mails to our domain A record, which is
not possible. Anyone has an idea what could cause external senders try to send
to the implicit mx instead of our mx? The same senders do not had problems
before or after this single event (at least not to my knowledge).
Hm.. if someone tried to send a message using MAIL
FROM:<any...@dd47428.kasserver.com> then bounces would be directed to
85.13.128.116, since that host has no MX.
Best
Ale
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