how to specify different outgoing IP

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how to specify different outgoing IP
\ tom lee (12 Mar 2008)
. \ Patrick T. Tsang (12 Mar 2008)
. \ mouss (12 Mar 2008)

Subject:	how to specify different outgoing IP
Group:	Postfix-users
From:	tom lee
Date:	12 Mar 2008

Hello,

For some users, they don't like our outgoing IP address.
telnet mx.abcd.com 25 will have infinite time out, I assume they blocked our
ougoing IP address. We don't have the problem to send to
all other users.

I wonder if it is possible that we can specify a different IP address as
outgoing mail address for those special user, but not other users?
my machine has configured eth0 and eth0:0 with two IP address. both IP has
reverse DNS settings.
so it should not be difficult to get the second IP address.

the document about smtp_bind_address mentions one way to do it is over
master.cf file with the syntax.

smtp ... smtp -o smtp_bind_address=11.22.33.44

If the intended outgoing IP is 11.22.33.44, my client's IP address is
12.12.12.12 or the mail server is mx.abcd.com,
wonder how can I make the change?

thanks
tom