John Levine via mailop skrev den 2023-05-24 01:58:
domains with this spf would possible know that spf is more weak then
then rfc 7505 (nullMX) ?
No, not at all.
SPF -all says a domain doesn't sent mail.
+1
if recipient check sender domain, its imho same thing
if recipent do not check sender domain its a diffrent
i just mention this since not all checks spf and enforce it, while if
nullmx is used its enforced
Null MX says a domain doesn't receive mail.
same thing
They often apply to the same domains, but they're not the same thing.
spf -all is not needed if its a nullmx domain
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