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RDNS pointing to the correct Host

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  • RDNS pointing to the correct Host

    Dear All,

    I have setup an exchange 2010 server and mail flows in/out ok. my AD is setup as xx.local and my internet domain is yy.com. How to I setup exchange to send email and present the correct host that is defined by RDNS yy.com so we avoid having server that check RDNS to reject our mail? Can i check this with my gmail account to see what the email is showing in the details of the mail header?

    Thanks

    Thomas

  • #2
    Re: RDNS pointing to the correct Host

    Talk to whoever handles your external DNS, could be either your web hosting company or less likely your ISP. You can check the reverse lookup by doing an nslookup on your domain name (E.g. mail.yy.com) and then doing another nslookup on the IP address that is returned. It should also resolve to mail.yy.com, rather than to a generic DNS name specified by your ISP.
    BSc, MCSA: Server 2008, MCSE, MCSA: Messaging, MCTS
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    Cruachan's Blog

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    • #3
      Re: RDNS pointing to the correct Host

      my isp has defined the RDNS as mail.yy.com and works ok. what do i change in exchange 2010 to make sure that this host is presented to other mail servers?

      Thanks

      Comment


      • #4
        Re: RDNS pointing to the correct Host

        You don't. Reverse DNS is determined by the gateway IP that your SMTP server sends from, so as long as that is the IP that you've setup all is well.
        BSc, MCSA: Server 2008, MCSE, MCSA: Messaging, MCTS
        sigpic
        Cruachan's Blog

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        • #5
          Re: RDNS pointing to the correct Host

          You may be thinkiing of the SMTP banner. That is set on the Send Connector. Otherwise you should also check that your firewall is doing a correct NAT presentation for outbound traffic.

          Use checkip.dyndns.org from the server itself. That will show you the current external IP address as seen by the internet. Verify it is what you are expecting.

          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.

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          • #6
            Re: RDNS pointing to the correct Host

            I have put up a basic web site that will show both the IP address and the host name lookup on the IP address, so that you can verify that the correct information is being passed and the NAT on your firewall is setup correctly.

            http://check.sembee.mobi/

            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

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