> 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.
I think the reality is that we are in 2024, and the chances of a human reading
postmaster@ are about the same as a human reading abuse@ .... i.e. nil.
The whole null-MX thing is very much perceived as the gold standard in security
conscious environments, e.g.
https://www.gov.uk/guidance/protect-domains-that-dont-send-email and
https://en.internet.nl/article/x-xss-protection-removed-and-improvement-for-no-mx-domains/
etc. etc. etc. etc. etc.
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