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From: Wietse Venema (wietseporcupine.org)
Date: Thu Feb 05 2009 - 13:27:49 CST
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> Bj_rn Ruberg:
> > Pablo Scheri wrote:
> > [...]
> > > The problem is that when I send mails to the postfix, for example 1000
> > > mails, It routes 990 to one of the exchange (10.0.0.208) and 10 to the other
> > > one (10.0.0.207).
> > > I alter the order of the A records to see if it changes, but did not.
> > >
> > > In the maillog the only difference I see is that the "delay=x" value in the
> > > 10.0.0.207 server is a very high number (40) and for the 10.0.0.208 server
> > > is 0.18 aprox.
> > >
> > > Does anyone know whats going on with it?
> > >
> > If your DNS servers are running on Microsoft systems, you may be
> > affected by their LocalNetPriority logic, which consider itself smarter
> > than round robin DNS.
> > See http://support.microsoft.com/kb/177883 for details.
> To prevent that problem, Postfix randomizes the order of DNS records
> that have equal preference.
You may want to do
$ postconf smtp_randomize_addresses
to find out if some idiot maintainer has disabled this feature.