On Thu, Jan 30, 2025 at 02:03:51PM +0100, Matus UHLAR - fantomas via mailop wrote: > Nowadays, we can mark domains that don't send mail using Null MX (rfc 7505).
The title of RFC7505 is "A "Null MX" No Service Resource Record for Domains That ***Accept No Mail***" (emphasis added). Assuming that a domain that contains a null MX record will not send mail seems doomed to false positives. Domains that do not *send* mail can indicate that with an all-deny SPF record. > Requiring MX to explicitly state "this domain does send/receive mail" would > clean up field a bit. Unless you set policy for one of the too-big-to-ignore mail service providers, I have doubts you'll have much success in making this opinion stick. But I've been known to be wrong before, so have at that windmill. - Matt _______________________________________________ mailop mailing list [email protected] https://list.mailop.org/listinfo/mailop
