Dňa 24. mája 2023 22:41:01 UTC používateľ Graeme Fowler via mailop
<mailop@mailop.org> napísal:
>[moderator note]
>
>SPF asserts senders (by definition)
>NullMX asserts receivers (also by definition)
>
>Interpretation aside, the fact they are (mis?)understood to be the same thing
>is a clear conflation. It may be language based, it may not, but please stop
>splitting this specific hair.
I am confused now as in RFC 7505 sect. 4.2 one can read:
Null MX is primarily intended for domains that do not send
or receive any mail...
And:
...mail systems SHOULD NOT publish a null MX record for domains
that they use in RFC5321.MailFrom or RFC5322.From addresses.
I understand that RFC as: nullMX's primary purpose is about
not receiving, but as side effect it can result as not sending too.
Is my understanding wrong?
Of course, the sending is affected only if receiver checks
return-path, but that is the same with SPF as it is usefull only
if SPF is checked...
regards
--
Slavko
https://www.slavino.sk/
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