Mark Sapiro writes:
> It isn't AFAICT. I was going to add it, but I am looking for a specific
> RFC reference. I have looked at several RFCs and I don't see anything
> that talks about rewriting domains in headers. All I found was RFC
> 1123 (STD 3), sec 5.2.2
As Lucy van Pelt ("The Doctor is 'In'") used to say to Charlie Brown,
THAT'S IT!!!!!!
<wink>
If you look at RFC 2821, you will discover that in section 2.3.5, it
specifically allows CNAME aliases in the "domain name" part of a
mailbox. I conclude that only the EHLO (HELO) command (and possibly
the server's greeting messages) has the restriction. The rationale is
that it is an error-reporting mechanism, which needs to be more
carefully specified since the system is known to be in a problem
state. See section 4.1.1, which specifies that the host specified by
a domain in EHLO should have a reverse mapping. Since a CNAME can't
have a corresponding PTR, the restriction in STD 3 follows.
"MX names" are also allowed, for what it is worth.
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