Tell ActionMailer to use a specific IP address to send

Hello everyone

Ubuntu 8.04 64bit Rails 2.3.2

I have multiple IP addresses on a server, with an alias setup to handle

eth0:0 IP
eth0 IP

We run one app on one IP, and the other on the other IP(ssl

The app on is allowed to send mail through our gateway.

What’s happening is that our Gateway is blocking emails from the app
that is setup to run on saying that the email came from

Is there a way that I can tell the ActionMailer to send from

Any help, greatly appreciated.