From: Victor Duchovni (Victor.DuchovniMorganStanley.com)
Date: Thu Nov 01 2007 - 08:43:35 CDT

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On Thu, Nov 01, 2007 at 01:35:46PM +0000, gordanbobich.net wrote:

> Hi,
>
> I'm seeing some strange behaviour with my Postfix setup. It occasionally
> doesn't try the MX records in the correct order. It will try a low
> priority one, and if the machine is on a local subnet but not running,
> it'll get back a "no route to host", and get stuck. It'll keep retrying
> this one quite a few times, before it gives up and rolls over to the high
> priority MX-es which it should have tried first.
>
> Is this a known bug?

Your anecdotal observations are flawed. Postfix makes new connections to
the MX hosts in the order supplied by DNS. Claims to the contrary need
to be backed up with detailed logging for the transactions in question,
including not only the final delivery success/fail indication, but also
any prior connection attempts or partial deliveries.

> Does Postfix try to cut a corner here and use the MX with the IP returned
> in the additional section, instead of going purely based on the MX list
> and trying the records in the priority order as it should?

It is pointless to speculate without evidence.

--
        Viktor.

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