How do internal smtp servers send mail to internal mail servers on the network?

Posted by dmr83457 on Server Fault See other posts from Server Fault or by dmr83457
Published on 2010-05-12T14:19:07Z Indexed on 2010/05/12 14:24 UTC
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emailserver

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windows-server-2003

We have upgraded our internal corporate email server and the IP address has changed internal to our network. A second email server is used for sending bulk jobs for a mailing list service that we offer.

Since the switch of the internal corporate server IP we have been seeing problems when the bulk email server is trying to send email to our own domain. The log shows that it is still trying to hit the old corporate server instead of the new one. I have looked through all settings for the bulk email software and see nothing set there to send to internal mail servers, and I do not recall doing anything special to get this working when setup a couple years ago.

Is there a setting in Win2003 or on the network that enables the mapping of MX record external IPs to internal IPs so mail gets routed correctly?

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