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Thread: Mails refused back in error 550 5.7.1

  1. #1
    Samp is offline Advanced Member
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    Default Mails refused back in error 550 5.7.1

    Since we migrate on Zimbra we got sometime mails refused in error 550 5.7.1 as:

    <c.traets@aflo.be>: host gw.aflo.be[87.66.26.108] said: 550 5.7.1 Your email
    messages have been blocked by the recipient OR by Trend Micro Email
    Reputation Service. Contact the recipient or his/her administrator using
    alternate means to resolve the issue. (in reply to RCPT TO command)
    These addresses had no problems before, have you an explication ?

    Thanks in advance.

    Sam.
    Release 6.0.7_GA_2473.DEBIAN5 DEBIAN5 FOSS edition.
    On Debian Vserver

  2. #2
    phoenix is offline Zimbra Consultant & Moderator
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    Quote Originally Posted by Samp View Post
    Since we migrate on Zimbra we got sometime mails refused in error 550 5.7.1 as:

    These addresses had no problems before, have you an explication ?
    The error message really means what it says and you need to contact the recipient mail admin and find out why the message was rejected.
    Regards


    Bill


    Acompli: A new adventure for Co-Founder KevinH.

  3. #3
    Samp is offline Advanced Member
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    Quote Originally Posted by phoenix View Post
    The error message really means what it says and you need to contact the recipient mail admin and find out why the message was rejected.
    Yes and it's what I do, but I have this problem with several mails addresses, we have changed our IP MX address perhaps it is the origin of this problem...

    Thanks for your help.

    Sam.
    Release 6.0.7_GA_2473.DEBIAN5 DEBIAN5 FOSS edition.
    On Debian Vserver

  4. #4
    phoenix is offline Zimbra Consultant & Moderator
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    Quote Originally Posted by Samp View Post
    Yes and it's what I do, but I have this problem with several mails addresses, we have changed our IP MX address perhaps it is the origin of this problem...
    I have absolutely no idea what the problem is, only the admin of the receiving server can tell you why it was rejected.
    Regards


    Bill


    Acompli: A new adventure for Co-Founder KevinH.

  5. #5
    Samp is offline Advanced Member
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    Quote Originally Posted by phoenix View Post
    I have absolutely no idea what the problem is, only the admin of the receiving server can tell you why it was rejected.
    Thanks for your help and I know that's the problem don't come from our server but I would like to know why it's come since our IP and MX change.

    Sam.
    Release 6.0.7_GA_2473.DEBIAN5 DEBIAN5 FOSS edition.
    On Debian Vserver

  6. #6
    phoenix is offline Zimbra Consultant & Moderator
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    Quote Originally Posted by Samp View Post
    Thanks for your help and I know that's the problem don't come from our server but I would like to know why it's come since our IP and MX change.
    Once you check with the receiving admin he'll be able to confirm the problem, it could be almost anything. You could start my checking if your domain or IP address is on any blacklists or if you have a reverse DNS for the IP etc., etc.
    Regards


    Bill


    Acompli: A new adventure for Co-Founder KevinH.

  7. #7
    uxbod's Avatar
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    Check your IP here :- MAPS - Support - Lookup Tool

  8. #8
    Samp is offline Advanced Member
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    Quote Originally Posted by phoenix View Post
    Once you check with the receiving admin he'll be able to confirm the problem, it could be almost anything. You could start my checking if your domain or IP address is on any blacklists or if you have a reverse DNS for the IP etc., etc.
    A check on DNSBL Information - Spam Database Lookup on our IP 88.191.228.233 are positive only on ips.backscatterer.org and dnsbl-2.uceprotect.net

    I don't know why !?

    Sam.
    Release 6.0.7_GA_2473.DEBIAN5 DEBIAN5 FOSS edition.
    On Debian Vserver

  9. #9
    Samp is offline Advanced Member
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    Quote Originally Posted by uxbod View Post
    Check your IP here :- MAPS - Support - Lookup Tool
    Yes we are on this DUL list !?

    I have post a mail to the administrator of the list to ask why and to remove our IP.

    Thanks for your help.

    Sam.
    Release 6.0.7_GA_2473.DEBIAN5 DEBIAN5 FOSS edition.
    On Debian Vserver

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