From: Victor Duchovni (Victor.DuchovniMorganStanley.com)
Date: Mon Dec 03 2007 - 09:16:03 CST

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On Mon, Dec 03, 2007 at 04:54:53PM +0200, Paul Hewlett wrote:

> I downgraded to 2.3.6 and mail is now sent successfully using the same config
> files.
>
> /var/log/messages shows:
> Dec 3 16:51:36 sundown postfix/qmgr[24971]: 1F736737D4C:
> from=<rootsundown.cpt.gccs.co.za>, size=596, nrcpt=1 (queue active)
> Dec 3 16:51:36 sundown postfix/smtp[24977]: 1F736737D4C:
> to=<supportcpt.gccs.co.za>, orig_to=<root>,
> relay=smtp.cpt.gccs.co.za[192.168.169.1]:25, delay=0.01, delays=0.01/0/0/0,
> dsn=2.0.0, status=sent (250 2.0.0 Ok: queued as 1D48018E142)
>
> As you can see $mydomain is now 'cpt.gccs.co.za' and the mail is now sent
> correctly. It's a bug in 2.4.5 and beyond.

There is no such bug in Postfix as distributed from postfix.org. Are you
using a binary Postfix distribution from a vendor? Such distributions have
in the past incorrectly computed the mail system name from reverse DNS
lookups of the IP address. This practice may have finally stoppped in more
recent vendor builds (steps have been taken to discourage this practice).

--
        Viktor.

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