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  1. #1
    AM Navigator Geno Prussakov's Avatar
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    May 10th, 2005
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    Question "Sender IP must resolve" - ?
    Trying to get through to two e-mail addresses on the same server, and keep getting this (no matter what e-mail address of mine I send them my e-mail from) with a bounce-back:

    The original message was received at Tue, 10 Jul 2007 15:34:07 -0400
    from [10.1.242.141]

    ----- The following addresses had permanent fatal errors -----
    <****@*******.com>
    (reason: 501 5.7.1 <info@amnavigator.com>... Sender IP must resolve)
    <****@*******.com>
    (reason: 501 5.7.1 <info@amnavigator.com>... Sender IP must resolve)

    ----- Transcript of session follows -----
    ... while talking to mail.********.com.:
    >>> MAIL From:<info@amnavigator.com> SIZE=4827
    <<< 501 5.7.1 <info@amnavigator.com>... Sender IP must resolve
    501 5.6.0 Data format error


    (Stars inserted by myself in place of the addressees' e-mail addresses and their mail server).

    What in the world does this mean? Does anybody know?

    My e-mails used to go through to them all the time before today...

    Many thanks in advance for your help.

    Geno

  2. #2
    ABW Ambassador
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    January 18th, 2005
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    You are sending from an anonymous proxy which they may not allow.

  3. #3
    AM Navigator Geno Prussakov's Avatar
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    Ok. Thank you very much, S-man! It must be the hotel Wi-Fi thing... Will send it out from a different proxy tomorrow then.

    Thanks again.

    Geno

  4. #4
    ABW Ambassador Rehan's Avatar
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    November 3rd, 2006
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    [Updated after original post...]

    "Sender IP must resolve" means that the receiving mail server wants to know the hostname (e.g., mail1.prussakov.com) that corresponds to the IP address of the sending server. Here at the Affiliate Summit hotel, the sending mail server is 12.24.185.200...but that seems to have no corresponding hostname. So the receiving mail server therefore refuses to accept the mail -- probably because it's paranoid about spam.

    The network at the hotel is intercepting all outgoing SMTP traffic and sending it via its own mail server rather than the one you have configured for your account. If you have a web-based interface for your email, try that and it should work.

  5. #5
    Classic Rocker Mack's Avatar
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    January 27th, 2007
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    Quote Originally Posted by Geno Prussakov

    501 5.6.0 Data format error

    Geno
    is not a valid ip address.

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