Cannot receive external email, using DDNS as DNS

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    chanyha
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    #126084

    Hi,

    I am using DDNS for my “DNS”. The Exchange 2000 server is able to sent mail but cannot receive external mail.
    Below is the error message tested from a web email client by replying the email any idea?

    he following addresses had permanent fatal errors



    (reason: 550 User unknown)


    Transcript of session follows


    … while talking to mx1.mailhop.org.:
    >>> DATA
    < << 550 User unknown
    550 5.1.1
    … User unknown
    < << 503 valid RCPT command must precede DATA
    Have done the following
    1) Check the DNS settings
    2) Check the SMTP port 25 by telnet

    At loss what to do. Please advise:o

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