How can I bind Postfix to only send outgoing mail via one IP address
(ie, always use the same ethernet interface)?
I have a server which has two IP addresses, one on eth0 and one on
eth0.1. I have discovered that some of my outgoing mail is being
rejected by over-zealous spam filters because it comes from the second,
which doesn't have reverse DNS configured (which is OK; I don't use it
for anything which needs it).
However, Postfix seems to pick the "wrong" interface for sending
outgoing mail, hence the problems above. How can I force it to always
use the one I want it to use?
Adding reverse DNS to the second IP is not the solution; I don't have
control over this and, in any case, all my existing mail DNS is set to
use the primary IP.
I've looked at the documentation, and can't see anything obvious.
inet_interfaces seems only to apply to inbound mail - that is,
interfaces from which Postfix will accept mail, not those which it uses
to send it.
Any clues, anyone?
Mark
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http://mark.goodge.co.uk
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