SMTP PIX Config

I have recently had to split my ingoing and outgoing mail onto differnet boxes due to a bug in my mail scanners.

Problem is my new outgoing mail server is not what my reverse DNS says, my incoming mail server is.

This is temporary as the incoming mail server also hosts the web site, and will be reactivated as soon as the bug is fixed (eta was been set at 1 week for an alpha!!!)

Incoming mail server is sending out SMTP mails for Spam/Virus/Rejections etc. still.

Can I get my PIX to make 2 server broadcast as the same address?