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Error 421 4.7.1 Recipient address rejected: <Backup mail exchanger not provided here>

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  • Error 421 4.7.1 Recipient address rejected: <Backup mail exchanger not provided here>

    Hi All,

    I'm having problem in sending email to one of my recipient, he can send and receive with any other system but somehow only my email address got blocked or rejected ?

    See the following error message:

    Your message wasn't delivered because of security policies. Microsoft Exchange will not try to redeliver this message for you. Please provide the following diagnostic text to your system administrator.

    The following organization rejected your message: mailin1.pacific.net.au.

    mailin1.pacific.net.au #<mailin1.pacific.net.au #4.7.1 smtp; 421 4.7.1 <[email protected]>: Recipient address rejected: Backup mail exchanger not provided here> #SMTP#
    Can anyone help me please ?

    Thanks,
    AWT

  • #2
    Re: Error 421 4.7.1 Recipient address rejected: &lt;Backup mail exchanger not provided h

    Not your problem.
    They have a server in the MX records which is not configured to accept email for that domain. They need to remove that server from the MX records.

    It could be a problem with the host. If their MX records point to the same hosting company then it could be that one of their servers are not configured correctly.

    Nothing you can do about it. The recipient needs to resolve it, either by correcting their DNS or asking their host to investigate.

    Simon.
    --
    Simon Butler
    Exchange MVP

    Blog: http://blog.sembee.co.uk/
    More Exchange Content: http://exchange.sembee.info/
    Exchange Resources List: http://exbpa.com/
    In the UK? Hire me: http://www.sembee.co.uk/

    Sembee is a registered trademark, used here with permission.

    Comment


    • #3
      Re: Error 421 4.7.1 Recipient address rejected: &lt;Backup mail exchanger not provided h

      thanks for the reply Sembee, does this means that my email server address is blocked by their ISP ?

      if yes, then I need to call them for removing my email server record from their black list.

      Comment


      • #4
        Re: Error 421 4.7.1 Recipient address rejected: &lt;Backup mail exchanger not provided h

        I don't know how you came to that conclusion based on what I have said.
        Has nothing to do with blacklisting.

        The problem is the recipient's DNS configuration, or the ISPs configuration.

        Simon.
        --
        Simon Butler
        Exchange MVP

        Blog: http://blog.sembee.co.uk/
        More Exchange Content: http://exchange.sembee.info/
        Exchange Resources List: http://exbpa.com/
        In the UK? Hire me: http://www.sembee.co.uk/

        Sembee is a registered trademark, used here with permission.

        Comment

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