[lug] multiple relayhosts (postfix)

[Lee Woodworth]

Ben wrote:
> I'm running postfix on our intranet and it sends all outgoing mail to an 
> smtp server with the config line:
> relayhost = smtp.isp.com
> 
> Our relayhost doesn't like large e-mails -- it just drops the connection 
> after 95% transmission and then postfix tries again since it never got 
> an error, just a dropped connection. The second attempt fails the same 
> way, and I've got an endless loop. A friend of mine opened up his smtp 
> server to me and I'd like to use it for large e-mails, but not for just 
> regular e-mails.
> 
> So, can I either:
> 
> a) have postfix use two relayhost, one primary and one if the first one 
> fails
> 
> b) configure postfix to send all e-mails over 10M to a second relayhost?
> 
> Maybe I missed it in the documentation, but I can't find anything about 
> setting multiple relayhosts (the relayhost line is a default route and 
> only take one address). And I can see how to specific what relayhost to 
> use based on destination of e-mail, etc, but nothing based on e-mail size.
> 
You'll get expert help from the postfix-users list on postfix.org. The message
size dependency is unlikely to be handled by the built-in capabilities.

> Thanks,
> 
> Ben
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