RFC5321.MailFrom is the address in the SMTP "Mail From" command
So is RFC5321.MailFrom the Reverse-Path from RFC5321, or only the
Mailbox part of a Reverse-Path? I would expect it to be the full
Reverse-path, because
RFCs 2821 and 5321 say:
Historically, the <reverse-path> was permitted to contain more than
just a mailbox; however, contemporary systems SHOULD NOT use source
routing (see Appendix C).
Source routes have been deprecated for 20 years. We can forget about
them.
and a Return-Path field usually contains "<" ... ">", so it cannot be a
plain Mailbox.
No, see RFC 2821 or 5321 sec 3.3. The reverse-path is what's between the
brackets, which means it's a mailbox or it's empty.
By the way, an RFC5321 mailbox allows address-literals which are not
covered by the right hand side of RFC8601's pvalue, and one cannot use
the left hand side because of
I haven't seen an address literal in non-spam mail for over a decade
either. I'm pretty sure we can forget about them in A-R headers, too.
R's,
John
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