Hi,

I've got mail gateways that act as MX's (mail is either relayed to our
backend mail servers or forwarded to a users external email eg
yahoo.co.uk) but are also used to send mail by our users (port 587).
I'm wanting to have forwarded/relayed mail going out from one IP and
stuff from submission going out from a different IP.
Is this possible with multiple routes in master.cf or do I need to
multiple instances of postfix? I think it requires the multiple
instances, but I wanted to be sure before look at that sort of
modification to our systems.

Thanks
Guy

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Don't just do something...sit there!