iptables - sendmail ip question

I've seen the answer to this here before but danged if I can find it now.

Anyway someone once posted an iptables formula for making all outgoing sendmail use one particular ip on the box for that sending, rather than just the main ip of the box.

I could use that formula now and I cannot find it, so someone hook me up iptables - sendmail ip question

 

 

 

 

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