Matus UHLAR - fantomas via mailop skrev den 2024-10-14 16:12:
"v=spf1 mx -all"
together with
"v=DMARC1; p=reject"
are both trivial and can work.
Yes, they can be made more complicated. Yes, mail can't be forwarded,
we need DKIM for that.
and dmarc needs dkim in some cases
spf would work if multiple domains have same mx hostname where ip is the
same, but it will fail if diffrent ips pr sending domains where mx is
still same
dont mix incomming and outgoing policy
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