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Frank Ellermann wrote:
Alex van den Bogaerdt wrote:
One doesn't need to receive mail in order to send mail. No 2821bis
needed for that.
Well, based on the notion that the receiver should always be able to
deliver a bounce to the return path, return paths that don't accept mail
could be considered unacceptable.
Strict 2821 implementations could reject "HELO ws" and "HELO ws."
as SMTP syntax errors.
I don't think this is correct. A strict interpretation of RFC 2821
requires only the "EHLO" command -- not the "HELO" command -- to have an
FQDN. (This is obviously due to RFC 821 _not_ requiring an FQDN with
"HELO", and due to many legacy implementations not giving one.)
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