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Exch 2007/SBS 2008 Cannot Receive Mail from some domains (no mailbox here 5.7.17)

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  • Exch 2007/SBS 2008 Cannot Receive Mail from some domains (no mailbox here 5.7.17)

    Hello everyone

    I have a static IP and Ive setup an SBS 2008 with Exchange. The static IP is from a local ISP and has reverse DNS. I can send and receive mail from some domains, including Gmail, Yahoo. From others I get the following messages:

    1.server5.site5.com #550-Verification failed for <[email protected]> 550-No Such User Here 550 Sender verify failed

    or

    2. sorry, no mailbox here by that name. (#5.7.17)

    The DNS on this domain is not held by the ISP providing the static IP. In the DNS zone ive set the MX record to point at the FQDN that resolves the static IP of the provider.

    In the Send Connector of the Exchange 2007 ive put the FQDN that resolves the static IP of the provider.

    Here is nslookup:
    kostass-macbook-pro-15:~ kostas$ nslookup
    > set type=mx
    > mydomain.gr
    Server: 192.168.16.100
    Address: 192.168.16.100#53

    Non-authoritative answer:
    mydomain.gr mail exchanger = 10 xxxx.static.otenet.gr.

    Authoritative answers can be found from:
    xxxx.static.otenet.gr internet address = xx.xx.xx.65

    The ISP providing the static IP refuses to add a PTR record for my domain, or even a CNAME. They say that they have a valid RDNS.

    Is there any way of solving this (the 5.7.17 errors)?



    The values in italics are changed from the real ones, but if necessary I can put the real ones.


    Thanks in advance

    Kostas Backas

  • #2
    Re: Exch 2007/SBS 2008 Cannot Receive Mail from some domains (no mailbox here 5.7.17)

    Neither of those errors are Exchange errors, they are being generated by something else.
    Ideally your MX records should point to a host name in your own domain, rather than the ISPs assigned host name. If you have a static IP address then create a new host in that domain name (A record type) and point it at your static IP address, then set it as your MX record.

    Reverse DNS would have nothing to do with those errors. Those errors mean what they say - the server the message was delivered to does not recognise that the user exists. What it does NOT mean is that the message was delivered to the correct server.

    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: Exch 2007/SBS 2008 Cannot Receive Mail from some domains (no mailbox here 5.7.17)

      Dear sir

      Thanks for your answer.

      The static IP is provided by an Internet provider, which does not provide the ability of edit zone records, until you buy a 16 block of IPs.

      Comment


      • #4
        Re: Exch 2007/SBS 2008 Cannot Receive Mail from some domains (no mailbox here 5.7.17)

        What you do with your own DNS records has nothing to do with the ISPs IP address assignment. I am referring to making changes on your own DNS in the domain that you own.

        The ISP should make reverse DNS changes for you if you ask. You are not asking them to delegate the IP addresses to you, just to make a change. The formation that you have currently posted will be flagged by some blacklists and will result in email being blocked.

        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: Exch 2007/SBS 2008 Cannot Receive Mail from some domains (no mailbox here 5.7.17)

          Originally posted by Sembee View Post
          What you do with your own DNS records has nothing to do with the ISPs IP address assignment. I am referring to making changes on your own DNS in the domain that you own.
          OK, Ill try that.

          The ISP should make reverse DNS changes for you if you ask. You are not asking them to delegate the IP addresses to you, just to make a change.
          They will not, if you have only one static IP like me. Only if you buy a 16 block of IPs.

          Thanks

          Kostas Backas

          Comment


          • #6
            Re: Exch 2007/SBS 2008 Cannot Receive Mail from some domains (no mailbox here 5.7.17)

            Any reason you cannot move your DNS nameservers to a different hosting company?
            Tom Jones
            MCT, MCSE (2000:Security & 2003), MCSA:Security & Messaging, MCDBA, MCDST, MCITP(EA, EMA, SA, EDA, ES, CS), MCTS, MCP, Sec+
            PhD, MSc, FIAP, MIITT
            IT Trainer / Consultant
            Ossian Ltd
            Scotland

            ** Remember to give credit where credit is due and leave reputation points where appropriate **

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