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MXToolbox and SMTP Reverse DNS Resolution

Discussion in 'Bind/DNS/Nameserver' started by InteractM, Aug 7, 2013.

  1. InteractM

    InteractM Well-Known Member

    Apr 2, 2013
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    When I try to test our server MX Toolbox returns an error for SMTP Reverse DNS Resolution

    "Reverse DNS FAILED! This is a problem."

    but I'm able to send/receive emails.

    Any clue what is going on? Or just MX Toolbox is not compatible with cPanel SMTP banners?
  2. cPanelMichael

    cPanelMichael Forums Analyst
    Staff Member

    Apr 11, 2011
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    Hello :)

    Have you checked to see if a RDNS entry is configured for the IP address you use to send email? Typically, you must send a request to your data center to have RDNS configured for your IP address pointing to the hostname of your server. The following command may be helpful to check if RDNS is configured:

    host IPAddress
    Thank you.
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