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I need to be able to specify what interface Postfix will use to deliver outbound mail on. What I am doing is setting up an SMTP gateway to deliver mail from different, unrelated groups. I plan to setup a separate instance of Postfix for each group to receive mail, and each instance will need to deliver on its own virtual interface.

The reason I need them separate is so that if one of the groups misbehaves and gets the server blacklisted, I don't want any of the other groups affected. But I don't want to have to setup entirely separate servers or VMs if possible.

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You're looking for smtp_bind_address and smtp_bind_address6. Details are available here.

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That's exactly it! Thanks a bunch – Alex Feb 11 '11 at 18:03
It's customary when the answer is correct to click the little tick mark next to the answer! People are more likely to answer future questions if you acknowledge previous correct answers! – Niall Donegan Feb 11 '11 at 18:23
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Would inet_interfaces do what you want?

When inet_interfaces specifies just one IPv4 and/or IPv6 address that is not a loopback address, the Postfix SMTP client will use this address as the IP source address for outbound mail. Support for IPv6 is available in Postfix version 2.2 and later.

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