Ask the Expert

Force Information Management System to send a name that is different from computer name

The hostname Exchange provides in the "EHLO" SMTP command is different from the reverse DNS name that the receiving SMTP host is able to find.

Is there a way to force the Information Management System to send a different name than the computer name? Example: I'm sending mail to a joe@isp.com, and his provider's SMTP uses reverse DNS as an antispam feature. My Exchange 5.5 box says "EHLO exchange.mydomain.com," but the ISP finds the reverse DNS to be "mail.mydomain.com" -- so it rejects the connection.

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To achieve this in Exchange 5.5 you will need to change the Fully Qualified Domain Name (FQDN) of the server to match what your ISP expects. If you are planning to migrate to Exchange 2000 or Exchange 2003 anytime soon, you can achieve a FQDN rewrite automatically by performing the following steps:
  1. Launch Exchange System Manager.
  2. View the properties of your SMTP Virtual Server.
  3. Switch to the Advanced Delivery tab.
  4. Input whatever FQDN (i.e., mail.mydomain.com) you need to override the server's FQDN.

Alternatively, you could just change or add it to the MX entry in your public DNS to account for the "mail" host record and "mail.mydomain.com" mail exchanger.


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Related information from SearchExchange.com:

  • Learning Center: Toolbox for Exchange administrators
  • Topics Library: SMTP


  • This was first published in May 2005

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