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Hi Raymond, Thanks for the reply, Raymond. The first solution seems to be plausible. How should the NAT settings be configured to tell the whole world antispam box is my smtp and not my firewall? Do I need to do port forwarding in this case? The second solution is what my recipient sees...

Hi all, Recently, I have this reverse dns issue that the recipient end is rejecting mails from my side. After conversing with the recipient, it was found the ip address of my antispam box is different when their server did a reverse lookup of my box. The ip address they received happened to be...