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HELO Response Sending Wrong IP Address

For some reason when I send email, fresh install of Exchange Server 2007 on Virtual Win03, my HELO response is giving the address of my firewall's WAN port rather than the NAT assigned external IP of the email server.  I can't find the problem anywhere on the SonicWall 2040 firewall nor in the Exchange settings.  

There is another in progress thread that might help.  If any additional info is needed please let me know as I will provide whatever is needed to help resolve this issue.
https://www.experts-exchange.com/questions/26426284/4-4-1-AND-4-4-2-SMTP-Send-Errors.html?anchorAnswerId=33517107#a33517107
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Bryon H
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this isn't an exchange setting, it's purely in the sonicwall.  you need to set up the back half of the one-to-one nat entry, i'll find some steps, one min
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Bryon H
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you already have rules that say, "when traffic comes in looking for exchange, send em inward to this inside address"

what you're missing is, "when the internal address of the exchange server leaves me, make it look like it's this other wan ip address"
obviously, make sure you're dealing with the correct outside ip address when adding the info above...

find out for SURE what your mx record points to (the external ip of your mail server).  

that ip will need to have the exchange service ports that you use, forwarded to it... and the router will want to spoof that internal ip address to the correct outside ip address.
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Thanks for the points and glad we could help.