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SMTP Address Masquerading no longer working

Running Mcafee E-mail Gateway 7.6.x.  


System was originally configured as dual homed, explicit proxy. One network connection in the DMZ (with a valid public IP address.) The 2nd network connection was on the private LAN behind the firewall. Mail for the domain was forwarded to our exchange server.


Recently I reconfigured the system to use a single network connection in the LAN. The firewall has a NAT entry that has the public IP address for point to the internal IP address. Address masquerading is no longer working. For example, should redirect to  The "test" option under address masquerading shows mail to "" should rewrite to "")   However mail is just being delivered to our exchange server (with out any rewriting.)   Since our exchange server does not actually have an account called "" the mail gets lost.   All spam-projection and virus-protection is working. As far as I can tell, masquerading should apply to e-mail regardless of whether it appears to heading from the Internet or two the Internet.


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