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Thread: Sudden problem: content-filter MTA-Blocked

  1. #1
    Join Date
    May 2010
    Rep Power

    Exclamation Sudden problem: content-filter MTA-Blocked

    I've got a mysterious problem that occurred today and is causing a lot of trouble.

    When my users send an email to <faxnumber> it is no longer being relayed to a faxserver on the LAN! The users are getting the following email from

    Undeliverable mail, MTA-BLOCKED

    The message WAS NOT relayed to:
    <>: [] said:
    554 5.4.0 Failed, id=19475-04, from MTA([]:10025): 554 5.4.0 Error: too many hops

    This nondelivery report was generated by the program amavisd-new at host Our internal reference code for your message is
    It has been working perfectly for a couple of weeks and suddenly this happens.

    I honestly don't know how to troubleshoot and looking for some enlightenment from the Zimbra gurus on here


  2. #2
    Join Date
    May 2010
    Rep Power


    I looked up the SMTP NDR code and it says that 5.4.0:

    DNS Problem. Check the Smart host, or check your DNS. It means that there is no DNS server that can resolve this email address. Could be Virtual Server SMTP address.
    I haven't made any changes to my DNS server running on the same Zimbra host, but just in case I restarted bind. HOWEVER, it hasn't resolved the problem.

    I've got to fix this before tomorrow morning. Please help.

  3. #3
    Join Date
    May 2010
    Rep Power


    As I don't have a clue how to fix this, I thought I'd restart everything with zmcontrol restart. Nonetheless, it hasn't solved anything, so I'm back to square one.

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