> I came across something that I have not seen before: a domain (call it
> example.com) that has no email addresses. No one sends or receives email
> for that domain.
If there is no email from sen...@example.com, the domain should say
so in SPF, DKIM, DMARC, and so on. Cloudflare has a webpage on how
to protect domains that do not send email.
> My doubt is that since the outgoing email server identifies itself as
> host1.example.com in the EHLO, is there a requirement or even an
> expectation that postmas...@example.com will be able to receive email.
Presumably those other domains list host1.example.com as an authorized
sender. Is that enough? If you're concnerned that the messages would
be flagged as suspicious, then RFC's aren't the whole story.
Wietse
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