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Re: master's mail backlog and upgrade time

On Fri, 18 Nov 2005, Stephen Frost wrote:
> * Ian Jackson (ian@davenant.greenend.org.uk) wrote:
> > Stephen Frost writes ("Re: master's mail backlog and upgrade time"):
> > > Then bounce it locally.  Duh.  No reason to force master to deal with
> > > the bounce messages you feel are 'right' to send.
> > 
> > I don't bounce it.  I reject it at SMTP time with a 4xx or 5xx code.
> Congradulations!  You've found the problem!

"*THE*" problem?

*THE* problem is related to master's MTA configuration, handling and
administration, and not in anything else that gives it extra work to do.

Bouncing crap to master is *a* problem, because one should not be bouncing
back stuff to middle-of-the-way MTAs that are known in one's setup, and
master certainly qualifies.

Since we are talking about it, it is not always trivial to special-case an
incoming connection for a local bounce instead of a SMTP-level bounce,
though.  At least not with all MTAs.

I can do so with postfix because I have a two-layer setup anyway (mail gets
twice through the system, for content filtering with extremely high input
rate.  I just tell the first instance to let master through, and the second
one to reject -- this causes a *local* bounce, as mail is already queued and
accepted).  I am not even sure if it can be done [in postfix] in a single
layer setup (smtpd->queues->MDA).  Anyone would know how to do it?

  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh

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