DCC - Postfix MTA mail hub implementation question

Paul Vixie paul@vix.com
Fri Aug 23 20:27:48 UTC 2002

> > if you're rejecting e-mail at the MTA level because it is invalid or
> > unwanted, then such rejection must be done synchronously (before the
> > final 250) or else you're stuck with unbouncable garbage and you've put
> > no disincentive on the sender to puke more of it in your direction.
> There is also this issue (which may not apply, depending on
> the granularity of the filtering rules / policies at the
> recieving MTA:
>   What to do if an item arrives with multiple RCPTs, and RCPT-A's
>   ruleset says "accept" and RCPT-B's ruleset says "reject".

user preferences have to be enforced at the mua level.  don't cross the
streams.  anything you want to do during smtp (before the final-OK) has
to be ignorant of the mua's preferences.

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