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Thread: 550 Rejected from Cpanel Server

  1. #1
    Join Date
    Feb 2008
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    Default 550 Rejected from Cpanel Server

    hi all

    newbie here, I just setup zimbra and running very good, tho i have to patch some glitch for ubuntu 7.10 amd64

    I have server#1 with cpanel domainA.com
    server#2 with with zimbra branch.domainA.com

    communication from zimbra branch.domainA.com to domainA.com working very smooth

    then we add new domain let's say domainB.com on server#2 running zimbra
    communication to other mail server like gmail and yahoo are OK
    but when we test sending mail to server#1 i've got immediate reply

    Code:
    This is the mail system at host  branch.domainA.com. 
    
    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 
    
    <abraham@domainA.com>: host  domainA.com[ip xxx.xxx.xxx.xxx domainA] said: 
        550-Verification failed for <test@domainB.com> 550-No Such User Here 550 
        Sender verify failed (in reply to RCPT TO command)
    FYI, on domainA server i modify exim to verify the sender, when I disable this, i can send the email fine from domainB.com but i don't want to disable this feature on exim

    please any clue?
    thanks in advance

  2. #2
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    Feb 2008
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    Default

    UPDATE:

    i deleted the domainB and all users with zimbra Admin
    then add domainB again
    create the same user and test sending mail to Cpanel server is now working
    no more 550 rejected, both with web-gui and mail client are fine

    hmm weird, just wondering...

    thanks all

  3. #3
    Join Date
    Feb 2008
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    Default

    Quote Originally Posted by bramvera View Post
    UPDATE:

    i deleted the domainB and all users with zimbra Admin
    then add domainB again
    create the same user and test sending mail to Cpanel server is now working
    no more 550 rejected, both with web-gui and mail client are fine

    hmm weird, just wondering...

    thanks all

    oh no
    happening again
    can anyone help me please

  4. #4
    Join Date
    Nov 2006
    Location
    Vienna, Austria (Europe)
    Posts
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    Default

    I see the same issue with sending from agmail account to
    the latest FOSS 5 Version.

    One time the error comes up 550 No Such User Here,
    if I try it one minute later it works.

  5. #5
    Join Date
    Oct 2005
    Location
    Thatcher, AZ
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    Default

    Try to grab as many logs as you can from the time that it happens.

  6. #6
    Join Date
    Feb 2008
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    Default

    i just drop off zimbra, i thought no one gonna answer it
    will try later when our company decide to use zimbra commercial or not

    thanks anyway

  7. #7
    Join Date
    Nov 2006
    Location
    Vienna, Austria (Europe)
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    Lightbulb

    For me the issue is solved, because it was a typo in the DNS-Zone records.

    It was so hard to find, because Gmail does not give you the IP address of your server which throws the 550 error message.

    It was found now as we had the 550 message from gmx.net which gives you the IP in the error message.

    Four things we learned.

    1. The above 550 error was not a ZImbra issue (for us).
    2. Tests from external should be done from ISPs delivering the minimum needed content for error messages
    3. Collect all your logs from all your servers in one central location to save time.
    4. Double and Tripple check all configuration settings (from DNS-Zone to Zimbra and Postfix configs)

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