https://bugs.exim.org/show_bug.cgi?id=2312
--- Comment #5 from Liam Morland <liam@???> ---
(In reply to Jeremy Harris from comment #3)
> I think RFC 5322 requires that the From: header contain a non-empty addr-spec
> (as opposed to the envelope from, where it can be empty).
RFC 3834: Since in most cases it is not appropriate to respond to
an automatic response, and the responder is not interested in
delivery status messages, a MAIL FROM address of <> MAY be used for
this purpose.
I agree that it is unusual.
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