Multiple Reverse DNS RRS feed

  • Question

  • I have two Internet E-Mail Domains delevering e-mails to my single Exchange 2007. When i tested my Exchange connectivity it gave me only one reverse DNS address. Is it ok or it should show both of my domains' mx records as reverse DNS?


    Thursday, March 3, 2011 8:43 PM


  • Hi CS,

    It is quite possible that one public domain has a reverse lookup record and the other does not. The main reason for having a reverse lookup record for a domain (in relation to mail) is so that recipient organisations that you send mail to can resolve your mail servers public IP address to the domain name used in your email. This is a security configuration which helps the recipient mail servers define whether to accept your mail. If you use a domain name that does not have a reverse lookup record you may find that when sending to some organisations your mail does not reach them.

    Kind Regards


    • Proposed as answer by Alan.Gim Tuesday, March 8, 2011 7:19 AM
    • Marked as answer by Alan.Gim Thursday, March 10, 2011 8:15 AM
    Thursday, March 3, 2011 10:41 PM