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  • 4.4.7 Delayed, Message still in queue

    Hi Guys!

    I'm having a weird problem with my exchange server (or maybe it is not my problem ).

    There is 4-5 domain that email can't be delivered. In the queue log, there is one that shows: "The connection was dropped by the remote host". I've contacted the company, we are not blocked

    The others; An SMTP protocol error occurred. I'me receiving after a few hours or a day;

    Reporting-MTA: dns;srv-exchange.altex.local
    Final-Recipient: rfc822;[email protected]
    Action: delayed
    Status: 4.4.7
    Will-Retry-Until: Sat, 28 Aug 2010 14:30:09 -0400
    X-Display-Name: [email protected]

    All other email (Gmail, hotmail,or other customers) are working fine, they receive our email.

    I've checked:

    -We are not on RBL (we were like 2 weeks ago, but we are no more on it, cause the server was sending external NDR message)
    -Virtual SMTP is working fine
    -DNS has the forwarders (ISP DNS)
    -Reverse DNS is working

    Thanks for any tips

    Christ

  • #2
    Re: 4.4.7 Delayed, Message still in queue

    Server sending external NDRs will not get you blacklisted.
    Failure to have recipient validation so you are sending backscatter will. If you have turned off NDRs then I suggest that you turn them back on again, and simply ensure that you have recipient validation enabled.

    The NDR that you have posted means the next host is dropping the connection. You could try a telnet session to their server and see if it does the same thing.
    Also remember that if any of the recipients are major ISPs, they don't use the public blacklists, they have their own.

    Simon.
    --
    Simon Butler
    Exchange MVP

    Blog: http://blog.sembee.co.uk/
    More Exchange Content: http://exchange.sembee.info/
    Exchange Resources List: http://exbpa.com/
    In the UK? Hire me: http://www.sembee.co.uk/

    Sembee is a registered trademark, used here with permission.

    Comment


    • #3
      Re: 4.4.7 Delayed, Message still in queue

      I tried telnet all the DNS we get problem.

      There is 3 on 4, That says: Your access to this mail system has been rejected due to the sending MTA's poor reputation.



      The other one does nothing, it seems to connect but no message and return to command line.

      Comment


      • #4
        Re: 4.4.7 Delayed, Message still in queue

        Source: http://www.senderbase.org/help/sbrs
        --
        The above link will show you your reputation ^^
        --

        What Does My Reputation Score Mean?

        By tracking a broad set of attributes for email and web, SenderBase supports very accurate conclusions about a given host. Sophisticated security modeling leverages the breadth of SenderBase data to generate a granular reputation score ranging from -10 (for the worst) to +10 (for the very best). On this page the granular reputation score is grouped into Good, Neutral and Poor for simplicity reasons.
        More
        Good = Little or no threat activity has been observed from your IP address or domain. Your email or Web traffic is not likely to be filtered or blocked*.

        Neutral = Your IP address or domain is within acceptable parameters. However, your email or Web traffic may still be filtered or blocked*.

        Poor = A problematic level of threat activity has been observed from your IP address or domain. Your email or Web traffic is likely to be filtered or blocked*.

        *While many networks use SenderBase as a means for assessing their email and web traffic, SenderBase does not block email or Internet traffic. If your email is being blocked or you feel it is not being delivered, you should check with your ISP.

        ----

        You might have to do a LOT of leg work and call the providers to convince them your domain is safe again.

        Hobie
        Last edited by Hobie; 27th August 2010, 20:09.

        Comment


        • #5
          Re: 4.4.7 Delayed, Message still in queue

          There are various reputation providers around, not just senderbase. It depends on what the remote site is using. However if you get the same error from three, then it is probably the same source. Find out which one they are using.

          The fourth site is probably using something similar, but is opting to drop the traffic rather than send back an NDR.

          All of them aren't really doing things the correct way, they should NDR it back so it fails, rather than a temporary error. You would then get the message back immediately rather than the messages hanging about in the queues.

          Simon.
          --
          Simon Butler
          Exchange MVP

          Blog: http://blog.sembee.co.uk/
          More Exchange Content: http://exchange.sembee.info/
          Exchange Resources List: http://exbpa.com/
          In the UK? Hire me: http://www.sembee.co.uk/

          Sembee is a registered trademark, used here with permission.

          Comment


          • #6
            Re: 4.4.7 Delayed, Message still in queue

            Hi Guys.

            Sorry for delay, I have been very busy.

            So I've took a look at senderbase and we where at poor, so I've contact them to put us at Neutral, They did it and wil lcheck if we are again spammer.

            There is no more problem now

            Thanks guys!

            Comment


            • #7
              Re: 4.4.7 Delayed, Message still in queue

              Originally posted by ChristTheGreat View Post
              Hi Guys.

              Sorry for delay, I have been very busy.

              So I've took a look at senderbase and we where at poor, so I've contact them to put us at Neutral, They did it and wil lcheck if we are again spammer.

              There is no more problem now

              Thanks guys!
              it was already stated above, but if an ISP is blocking you, then you will have to call them and they will check their list to see if your IP is in their system.

              i had this happen to a friend of mine. all emails to comcast.net were failing. i told him to call comcast and see if he was on a block. the first tech he connected to told him that he wasnt, but i insisted that he tried again (it had happened to me in the past and this is how i knew he had to try them again). sure enough, the second tech was able to confirm that his IP was on a blacklist.

              Comment

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