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Thread: Open Relay warning in zimbra.log, can't send to gmail accounts

  1. #1
    jsanabria is offline Starter Member
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    Default Open Relay warning in zimbra.log, can't send to gmail accounts

    Here's a problem with a company's zimbra server. They can't send any mails from their domain to gmail accounts.

    When attempting to send to my gmail account they receive the following mail back:
    This is the mail system at host mail.farmaciacatedral.com.py.

    I'm sorry to have to inform you that your message could not
    be delivered to one or more recipients. It's attached below.

    For further assistance, please send mail to postmaster.

    If you do so, please include this problem report. You can
    delete your own text from the attached returned message.

    The mail system

    <myaccount@gmail.com>: host gmail-smtp-in.l.google.com[74.125.45.27]
    said: 550-5.7.1 [190.128.228.134 1] Our system has detected an
    unusual rate of 550-5.7.1 unsolicited mail originating from your IP
    address. To protect our 550-5.7.1 users from spam, mail sent from your IP
    address has been blocked. 550-5.7.1 Please visit
    Bulk Senders Guidelines - Gmail Help to review 550 5.7.1 our Bulk
    Email Senders Guidelines. g67si16254245yhk.95 (in reply to end of DATA
    command)


    What's more, when checking into /var/log/zimbra.log I found these entries there:
    Aug 27 06:53:18 maila amavis[10627]: (10627-03) Checking: p5bnAWbPdCAz [186.17.135.125] <test@companydomain.com> -> <myaccount@gmail.com>
    Aug 27 06:53:18 maila amavis[10627]: (10627-03) Open relay? Nonlocal recips but not originating: myaccount@gmail.com


    where myaccount@gmail.com would be my gmail account and test@companydomain.com is the mail account used to send test emails to my account.

    I also used mailradar.com to test if their mail server is an open relay, here is the result:
    [Method 18]
    <<< 220 mail.farmaciacatedral.com.py ESMTP Postfix
    >>> HELO mailradar.com
    <<< 250 mail.farmaciacatedral.com.py
    >>> MAIL FROM: <antispam@[190.128.196.254]>
    <<< 250 2.1.0 Ok
    >>> RCPT TO: <relaytest@mailradar.com@>
    <<< 504 5.5.2 <relaytest@mailradar.com@>: Recipient address rejected: need fully-qualified address
    >>> QUIT
    <<< 221 2.0.0 Bye
    All tested completed! No relays accepted by remote host!


    It has obviously passed this test, so would any of you help me? Why this company can't send mails to gmail accounts? I'm kind of new in this whole zimbra world so if here's not all the information needed to help me please let me know.

  2. #2
    kruon is offline Loyal Member
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    Default

    Quote Originally Posted by jsanabria View Post
    host gmail-smtp-in.l.google.com[74.125.45.27]
    said: 550-5.7.1 [190.128.228.134 1] Our system has detected an
    unusual rate of 550-5.7.1 unsolicited mail originating from your IP
    address. To protect our 550-5.7.1 users from spam, mail sent from your IP
    address has been blocked. 550-5.7.1 Please visit
    Bulk Senders Guidelines - Gmail Help to review 550 5.7.1 our Bulk
    Email Senders Guidelines. g67si16254245yhk.95 (in reply to end of DATA
    command)[/I]
    Sounds like compromised account to me. Check the log again and see which account is sending large amounts of mail with gmail as destination.

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