From: Magnus Bäck (magnusdsek.lth.se)
Date: Wed Aug 02 2006 - 08:49:38 CDT

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On Wednesday, August 02, 2006 at 15:20 CEST,
     "Coffey, Neal" <ncoffeylangeveld.com> wrote:

[...]

> That said, I can't find much information about the relay transport in
> the docs. The page on transports has a link for smtp, local, and
> virtual but not relay. So, looking at my master.cf, plus the
> bottleneck analysis page and a little intuition that it's just an
> SMTP process, so I'm assuming that the main benefits are:
>
> * Doesn't take away from the incoming SMTP process limits
> * Can be tuned seperately

Correct.

> Are there any inherent benefits in (or differences with) using the
> relay transport, even if no hand-tuning is done? And where do I
> look for the documentation on this? :) (I'm on version 2.3.1.)

Unless I'm mixing up the "new" qmgr(8) (default since Postfix 2.1)
with the old one (now available as oqmgr(8)), the advantage of having
a separate transport for inbound messages is that the queue manager
schedules messages not only to give fairness with regard to each
destination but also with regard to each transport.

I don't think the scheduling algorithm is documented in detail anywhere.
I did not find a description of the preemption rules used in the new
qmgr.

--
Magnus Bäck
magnusdsek.lth.se

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