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Thread: DNS/MX issue

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  1. #1

    DNS/MX issue

    Dear all,

    our problem is that certain MX/DNS resolutions are not working properly for external users trying to send us

    For example, mail users at are getting rejected when trying to send an email to us at "".
    This mail is rejected as the user "" as
    not a valid email address.
    It appears that YAHOO is resolving our CNAME and although
    people are trying to send to it is being re-
    solved to which our mail server rejects.

    Amazingly mails for example from, or are working!

    Would be great to find here a solution and/or an expla-
    nation for this instance.

    THX, Rainer

  2. #2
    Super Moderator Roxoff's Avatar
    Join Date
    Aug 2005
    Nottingham, England
    I'm not sure how your mail configuration is set up, but you should try doing this:

            IN    MX    0
    mail    IN    A          x.x.x.x
    of course, subsituting your real IP address as x.x.x.x, and using your real domain and mailserver name.

    And dont forget it can take several hours for the changes to be seen by some ISPs.
    Linux user #126863 - see

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