Alessandro Vesely wrote:
RFC 5230 is an application of RFC 3834. There is no reference
in 2821bis. I recall that John discussed it with Keith, maybe
that should be fixed, adding an RFC 3834 reference in 4.5.5 (?)
I would not call that a "fix".
Forwarding mail from server scripts often results in messages
transferred with an empty MAIL FROM, RFCs notwithstanding.
Forwarders are unrelated to RFC 3834 "auto-replies" by mailbots,
compare <http://www.openspf.org/Frank_Ellermann/Auto-responders>
Some even hypothesize a BCP candidature for such "modernism"...
I have never heard of that idea, and don't think that it is good,
but of course adding "or BCP" to "standards-track" would be okay
in 4.5.5.
Frank