DCC - Postfix MTA mail hub implementation question

Dave Lugo dlugo@etherboy.com
Fri Aug 23 20:53:24 UTC 2002

On Fri, 23 Aug 2002, Paul Vixie wrote:

> >
> >   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.

Paul Vixie also wrote:
> 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.

If you're defining acceptence prefs for an entire domain, yes.  If
you want to allow user-level granularity, it would be better IMVHO
to reject (if possible) before the 250, and have some mechanism for
the edge case I described.  I admit it isn't pretty.

Dave Lugo   dlugo@etherboy.com    LC Unit #260   TINLC
Have you hugged your firewall today?   No spam, thanks.
Are you the police?  . . . .  No ma'am, we're sysadmins.

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