Load balancing outgoing mail relay

Charles Trevor ct.lists at qgsltd.co.uk
Wed Jan 17 14:23:18 UTC 2007

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?


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