From: Coffey, Neal (ncoffeylangeveld.com)
Date: Wed Aug 02 2006 - 08:20:48 CDT

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Magnus Bäck wrote:
> Also consider using the relay transport instead of smtp to decrease
> the risk of having your outbound messages starve your inbound
> messages.

I'm setting up a mail relay host that's currently serving almost 100 people, is going to get about 300 more in the coming weeks, and maybe another few hundred after that, spread over 3-4 domains. So, this stood out to me. (I haven't read through all the performance tuning docs...for shame, I know.)

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

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.)

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