It appears that Ellenor Agnes Bjornsdottir via mailop
<large.hadron.colli...@gmx.com> said:
>No place for 252 ("I've accepted your message and I will do my best, but
>you'll have to wait on word from the recipient before considering it
>delivered")?
If you look at RFC 5321, you'll see that 252 only applies to the
nearly forgotten VRFY and EXPN commands.
The design of SMTP quite clearly says that if you accept a message, you are
responsible
for it and you should either deliver it or send back an NDN if not. I realize
that
modern practice somewhat deviates from this, but nobody's ever had much use for
notifications that "yes I delivered the mail" even though there's been a spec
for
that for a long time.
R's,
John
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