Re: OT? /dev/null 5.1.1 email

[Jim Popovitch <jimpop () yahoo com>]

On Tue, 2005-07-05 at 09:42 -1000, Randy Bush wrote:
> > Should undeliverable email (5.1.1, User unknown) be directed
> > to /dev/null rather than responded to?
>
> one current fashion is to try to catch it as early in the smtp
> receipt process as possible and reject the mail to the smtp
> sender.  this gives the rejection to the real source as opposed
> to the joe job name.

Thanks Randy,

It just dawned on me that rejects are in fact occurring early in the
receipt process on the primary MX.  This is nicely done via Sendmail's
virtualusers table having a complete and accurate list of who is valid
for the domains handled by that MX.  

However, is seems the problem is over on the secondary MX (Postfix)
which only has a list of legit relay domains for pMX.  When pMX is back
online sMX fwds it's queue, but at that point pMX rejects to sMX...who
then rejects to Sender.  I'm not sure how I can get away from that
happening.

-Jim P.