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Exchnage 2003 - Relaying Issue via SMTP Connector

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  • Exchnage 2003 - Relaying Issue via SMTP Connector

    Ok all i think i know the reason why this is falling over but i just wanted to get your opinions on it.

    Right from the start here we go...

    I installed a new Exchange 2003 Standard Server last week and have update the server with the latest Windows updates and Exchange updates from MS.

    I have configured a routing group conncetor between here and our head office and i can send mail with no problems over this link.

    When i configure a SMTP connector and add the smarthost of our spam/virus checker i start gettting a relay error on all external messages being sent. The message i get is

    5.7.1 Relay Access is denied.

    Now i tested the relaying on the server with the RG connector only and again it works flawlessly. I can telnet to the server and send mail with no errors.

    I add the SMTP connector and try and it seems to go through with no issues but still bounces back with a 5.7.1 Relay access denied. I try to telnet to the smarthost and do the same and i also get a 5.7.1 Relay Access denied before i even get a chance to send.

    Now i am of the thinking that my smarthost has a problem relaying for our server and i have already spoken to them about it so before i go barging in i would like your thoughts and recommendations for any other testing that i can do.

    Ta muchly

  • #2
    Re: Exchange 2003 - Relaying Issue via SMTP Connector

    Do the two servers come out of the network with the same external IP address?
    If you set the RGC again, then set the SMTP connector to use as a bridgehead the server that works correctly - does that work?

    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: Exchange 2003 - Relaying Issue via SMTP Connector

      Originally posted by Sembee View Post
      Do the two servers come out of the network with the same external IP address?
      No they don't. The brisbane server is on its own range of IP addresses as is our server here in Lelystad. I'm of course presuming that is what you mean.


      Originally posted by Sembee View Post
      If you set the RGC again, then set the SMTP connector to use as a bridgehead the server that works correctly - does that work?

      Simon.
      I haven't tried that. I'll try and do it first thing tomorrow and let you know.

      Comment


      • #4
        Re: Exchange 2003 - Relaying Issue via SMTP Connector

        Originally posted by wullieb1 View Post
        No they don't. The brisbane server is on its own range of IP addresses as is our server here in Lelystad. I'm of course presuming that is what you mean.
        I bet that is the problem then.
        The service provider is allowing your servers to connect based on the IP address the traffic is coming from. It is different, so it rejects it.

        Rather daft using IP address to control relaying - should be authentication based, preferably wrapped in TLS/SSL.

        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


        • #5
          Re: Exchange 2003 - Relaying Issue via SMTP Connector

          Originally posted by Sembee View Post
          I bet that is the problem then.
          The service provider is allowing your servers to connect based on the IP address the traffic is coming from. It is different, so it rejects it.

          Rather daft using IP address to control relaying - should be authentication based, preferably wrapped in TLS/SSL.

          Simon.
          What i might do then is send it via abother of our sites that use the same service as this one.

          The office i'm sending it through at the moment handles its own spam and virus checking rather than outsourcing it to this other company.

          I've raised a call with the outsourcer and i'll see what they say in the morning. Bit of a nightmare as they are based in Oz and i'm here. Very little overlap. I wondered if it was the ISP that could be stopping it but the IP address i've given them is the same one that shows on whatismyip.com. Christ i've even resorted to resetting the NAT policies in my firewall in the hope that it was something as daft as that.


          Well i'll just need to wait till tomorrow now and see what that brings.

          Thanks for the help so far Simon.

          Comment


          • #6
            Re: Exchnage 2003 - Relaying Issue via SMTP Connector

            Well just as i supsected it was a problem with the outsourced mail filter company.

            Simon you were spot on with your deduction that they were using the IP address as the trusted source, crazy i know.

            Once they actually added the server to there trusted relay servers all was good.

            Pain in the ass big time though.

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