Dňa 24. septembra 2023 23:40:38 UTC používateľ Jasen Betts via Exim-users <exim-users@???> napísal:
>Such a per-domain database with public sender opt-in exists.
>It is called DMARC
No, DMARC is not "must have DKIM" DB, as it is SPF **or** DKIM.
Main problem (in this case) is, that it is not your DB/decision and
that not all are using DMARC. And, DMARC without DKIM is
suggested way to prevent forwarding...
And do not forget, that DMARC's RFC is informational only...
regards
--
Slavko
https://www.slavino.sk/
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