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All email send to domain with mx records *-nl.mail.eo.outlook.com get stuck in the qu

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  • All email send to domain with mx records *-nl.mail.eo.outlook.com get stuck in the qu

    Hello,
    All email send to domain with mx records *-nl.mail.eo.outlook.com get stuck in the que with error 451 4.4.0 DNS query failed.
    When i do a mx lookup to these domains i get a time out.
    if i do a lookup to these domains to another lokal dns server i get no time out
    If i do a lookup to these domains from a workstation i don't get a time out but it takes about 10 seconds before i get an answer.
    When i do i lookup to other domains i get no time out.
    The problem begins last week. Before that everythings works fine.
    We are working with SBS 2011 en exchange 2010 sp3. All email goes via edge server in DMZ.
    Have anyone ideas?

    Ino

  • #2
    Re: All email send to domain with mx records *-nl.mail.eo.outlook.com get stuck in th

    Check to see if any of your public IPs are on a blacklist.
    http://mxtoolbox.com/blacklists.aspx
    "...if I turn out to be particularly clear, you've probably misunderstood what I've said” - Alan Greenspan

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    • #3
      Re: All email send to domain with mx records *-nl.mail.eo.outlook.com get stuck in th

      clear resolver cache and restart dns services on the troublesom server
      Please do show your appreciation to those who assist you by leaving Rep Point https://www.petri.com/forums/core/im.../icon_beer.gif

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