On Fri, 14 Jan 2005, Hannah Schroeter wrote:
Is this specified in the standards that all mail with MAIL FROM: <>
is allowed to have only one recipient?
It is specified that there is only one MAIL FROM. A MAIL FROM: <> is
reserved for returning DSNs to the MAIL FROM. Hence there can be
only one RCPT when MAIL FROM is <>.
Say I have this aliases file on foo.domain
a: b(_at_)bar(_dot_)domain, c(_at_)bar(_dot_)domain
Now, I receive a bounce to a(_at_)foo(_dot_)domain, then I'd usually bundle
the forward into one SMTP transaction, and voilà, you have a MAIL FROM:
<>, with 2 RCPTs.
Yuuck. You have a point. However, for any DSNs entering *my* MTAs,
that situation can never legitimately occur. For the general case, I hope
someone knows whether the RFCs address this explicitly so I don't have to go
look it up.
--
Stuart D. Gathman <stuart(_at_)bmsi(_dot_)com>
Business Management Systems Inc. Phone: 703 591-0911 Fax: 703 591-6154
"Confutatis maledictis, flamis acribus addictis" - background song for
a Microsoft sponsored "Where do you want to go from here?" commercial.