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ERROR: A CNAME appeared in the MX records

Discussion in 'General Discussion' started by asmar, Jul 19, 2004.

  1. asmar

    asmar Well-Known Member

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    Hi guys,

    I am getting the following report from dnsreport when I am trying to test my email settings for a domain that make use of virtual hosting (the main domain with static IP related to mail server is working fine)

    Step 1: Try connecting to the following mailserver:
    [ERROR: A CNAME appeared in the MX records; this is not valid. Mailservers should NOT send to mail.cottonfine.gr.]
    mail.something.gr. - 67.*.*.*


    Any suggestions?
    Am I doing something wrong?
     
  2. torwill

    torwill Well-Known Member

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    check you zone files

    check if

    mail CNAME youdomain.com.
    and
    yourdomain.com. MX mail.yourdomain.com.

    exists

    if yes,

    change it to

    mail A 222.222.22.2 (your IP)
     
  3. asmar

    asmar Well-Known Member

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    Thanks a lot, that solve the problem but I'm still getting warnings like:

    WARN: One or more of your mailservers does not accept mail in the domain literal format (user@[0.0.0.0]). Mailservers are technically required RFC1123 5.2.17 to accept mail to domain literals for any of its IP addresses. Not accepting domain literals can make it more difficult to test your mailserver, and can prevent you from receiving E-mail from people reporting problems with your mailserver. However, it is unlikely that any problems will occur if the domain literals are not accepted.

    mail.something.com's postmaster@[67.*.*.*] response:
    >>> RCPT TO:<postmaster@[67.*.*.*]>
    <<< 501 : domain literals not allowed


    and


    WARNING: One or more of your mailservers may be claiming to be a host other than what it really is (the SMTP greeting should be a 3-digit code, followed by a space or a dash, then the host name). This probably won't cause any harm, but may be a technical violation of RFC821 4.3 (and RFC2821 4.3.1).

    mail.something.com claims to be host mymainaccount.something.com.


    Any suggestions?

    Many thanks
     
    #3 asmar, Jul 19, 2004
    Last edited: Jul 19, 2004
  4. sawbuck

    sawbuck Well-Known Member

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    Those 2 warnings are nothing to be concerned about.
     
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