Dňa 26. apríla 2024 12:52:51 UTC používateľ Benny Pedersen via mailop
<mailop@mailop.org> napísal:
>MX is optional not required if A/AAAA exists with same domain, many admins say
>if MX does not exists. then domain does not want email, this is fails also,
>hope more mta admins know this
AFAIK it is clearly defined in RFC 5321, sect. 5.1:
... If an empty list of MXs is returned, the address is treated as if it
was associated with an implicit MX RR, with a preference of 0, pointing
to that host.
In other words, no MX (eg. for example.net) is the same as:
example.net. IN MX 0 example.net.
If some admins are smarter, it is their problem...
IMO Null MX is way to tell: "we do not accept mails", IIRC the Null MX's
RFC warns, that it can imply: "we don't send mails" too, but that is side
efect only (as no bounce can be delivered).
regards
--
Slavko
https://www.slavino.sk/
_______________________________________________
mailop mailing list
mailop@mailop.org
https://list.mailop.org/listinfo/mailop
