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Unresolvable RFC.5321 domain at Yahoo – Word to the Wise
https://wordtothewise.com/2023/05/unresolvable-rfc-5321-domain-at-yahoo/
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Seen this recently? 451 Message temporarily deferred due to unresolvable RFC.5321 from domain; see This is Yahoo doing some extra work to identify that the 5321.From domainThe return-path, aka the …
