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  1. #1

    PTR entries for mail server


    I have Bind dns server/web server and mail server. I have been facing one problem while sending mails. Some of the mails come back with error saying a valid PTR record not found. My setup is as below:

    DNS server/web server x.x.x.34 x.x.x.35

    mail server

    total 5 domains are hosted on above dns server/web server and mail server. Please guide me on proper DNS entry and PTR record for each domain. I checked on net but got confused.

  2. #2

  3. #3
    Linux Guru Lazydog's Avatar
    Join Date
    Jun 2004
    The Keystone State
    In your reverse zone you need to add the ip address like so;

    37        PTR


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  5. #4
    But my mail server host name is, then what would be the PTR in zone file ?
    Also do I need to have separate reverse zone files for all 5 domains ?

    My detailed setup is as below: x.x.x.34 x.x.x.35

    mail hosting server is zimbra collaboration suite and the hostname is -> and IP address is x.x.x.37

    5 domains:

    The name server is also web server and handles all above 5 domains as far as dns and http is concerned. so all domains have single IP address i.e.x.x.x.34 & 35
    Mail server handles above 5 domains and have IP address x.x.x.37

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