On Fri, 1 Jul 2022, Jaroslaw Rafa via mailop wrote:

Dnia  1.07.2022 o godz. 10:00:00 Paul Smith via mailop pisze:
If you don't want to accept mail for a domain, usually, you'd accomplish
that by simply not having an MX record.

Not having a MX record AND not having an A record as well.

   AND no AAAA record.

Otherwise, if there is no MX record but there is A record, mail will be
delivered to the mailserver A record points to. Of course assuming that
there is a mailserver on that machine that listens on port 25...

--
Andrew C. Aitchison                      Kendal, UK
                   [email protected]
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