[IMail Forum] Weird problem

[Edward Ingram]

Right now, we’ve got our mail server on the outside of our firewall, using a routable IP address and it works fine.  However, if I move the server to the inside and give it an IP of 192.168.0.x, then it starts acting weird.  It will send mail out fine, but any mail sent to it, unless the mail address specifically says [EMAIL PROTECTED], it will reject it.  Sending mail to [EMAIL PROTECTED] doesn’t work, and it will come back with Undeliverable message.  I’ve checked our DNS and of course, we do have an MX record that points domain.com to mail.domain.com.  I’m not sure it’s firewall related because if I point a client on the inside directly to that IP (meaning, I’m sending and receiving mail directly to/from the mail server and not going through the firewall) it still doesn’t work.  I followed the instructions on IPswitch’s website on how to change the IP of a domain and I’ve been able to do this before with success.   Any ideas?  This one has got me stumped.   Ed