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Date:      Wed, 17 Jan 2007 13:56:26 +0000
From:      Charles Trevor <ct.lists@qgsltd.co.uk>
To:        freebsd <freebsd@gorlani.net>
Cc:        FreeBSD Questions <freebsd-questions@freebsd.org>
Subject:   Re: Load balancing outgoing mail relay
Message-ID:  <45AE2B0A.3090509@qgsltd.co.uk>
In-Reply-To: <000801c73a23$017bdeb0$6601880a@Enigma>
References:  <000801c73a23$017bdeb0$6601880a@Enigma>

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freebsd wrote:
> Hi
> I have a simple question but googling does not lead to a valid/usable 
> answer.
> I need to load balance OUTGOING emails. I have serveral smart hosts. I 
> need my internal SMTP server to send mail using ALL of the smart hosts 
> together, making some kind of load balancing (no need for wheighted one).
> Someone pointed out to use a name for the smart host, and have DNS to 
> resolve that name to the IP of all the relays (multiple A records) but 
> this turned out in doing failover, not load balancing.
> Anyone has a *working* idea for solving this apparently simple problem?
> Thanks
> 
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This (multiple A records) works for me, at least approximately. Both 
Bind and MS DNS will round robin when multiple A records exist for the 
same hostname. What is your setup?

Charlie




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