accept everything, send DSNs as needed later (was: acceptings partically


John C Klensin wrote (2007-07-17):

Arnt Gulbrandsen <arnt(_at_)oryx(_dot_)com> wrote:


My code to implement this does

     if all rejected
        answer "CR LF . CR LF" with 5xx
    else if all accepted
        2xx
    else
        2xx, and send a DSN with the exact details

The third case is very, very uncommon in practice, so I'm not
all that worried by its ill effects.

yep.  It is also no worse than "accept everything, send DSNs as
needed later" which, for better or worse, 2821 explicitly
contemplates.


BTW, while I'm still catching up with old messages:  The BSI, a
federal agency for IT security in Germany, allegedly recommends
that all federal organizations in Germany cease to send NDRs,
ignoring RFC 2821 for better or worse:

<http://www.heise.de/ix/news/meldung/96350> (German article)
<http://purl.net/net/de2en/heise.de/ix/news/meldung/print/96350>
The second link is a crude translation provided by Google.

 Frank

accept everything, send DSNs as needed later (was: acceptings partically a message)