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SMTP Proxy - Mask Source IP?

Jack1
I have an exchange e-mail server inside on my DMZ network.  I use the SMTP proxy to receive messages and forward them to the e-mail server.  The proxy also relays outgoing messages for the e-mail server in the DMZ.  How do I prevent the source IP address of the e-mail server and the DMZ interface from appearing in the full headers of outgoing e-mail messages?  I have tried enabling SNAT to re-source DMZ IPs to the external IP, but that doesn't seem to have worked.  Or maybe I didn't do it right. DMZ-SMTP-Any to External_IP

eg.
Received: from unknown (HELO server.domain.com) (172.22.10.100) by 172.22.10.10 with SMTP; Date/time, etc.


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