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  • Cannot send email by using DNS to route the mail

    If we forward all mail to a smart host outgoing mail works fine.
    If i change the setting on the connector "USE DNS TO ROUTE TO EACH ADDRESS SPACE ON THIS CONNECTOR" it doesnt work.

    It used to work fine, and the DNS all seems to be setup okay,
    I have downloaded smtpdiag, and it says all is ok

    I have even used telnet and ported to a mail server and sent email through the command prompt, and it worked.

    In the SMTP connector I have put in the external DNS under delivery,advanced configure,

    Mail just sits in the queue but never actually goes out,

    I cant figure it out at all, its so frustrating

    Pls help

  • #2
    Re: Cannot send email by using DNS to route the mail

    what error message does it have in the queue ?
    Could you screen-dump the queue for us ?
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    • #3
      Re: Cannot send email by using DNS to route the mail

      nothing at all, just sits in the queue and the retries accumulate then it gets returned

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      • #4
        Re: Cannot send email by using DNS to route the mail

        Take the external DNS out of the SMTP connector and on the SMTP virtual server.
        Ensure that there isn't a smart host set on the SMTP virtual server.
        Ensure that there isn't authentication settings configured on the SMTP virtual server.

        Simon.
        --
        Simon Butler
        Exchange MVP

        Blog: http://blog.sembee.co.uk/
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        • #5
          Re: Cannot send email by using DNS to route the mail

          didnt seem to do the trick.

          Virgin say there is no authentication on the DNS because we have an address on their range, and it should just go out, but it doesnt

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          • #6
            Re: Cannot send email by using DNS to route the mail

            Why not put in your DNS server and let it take care of the external lookups, either using forwarders or root hints.
            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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            • #7
              Re: Cannot send email by using DNS to route the mail

              do you mean the internal dns server address?

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              • #8
                Re: Cannot send email by using DNS to route the mail

                yes, I suspect that's what Ossian means.

                Logical network infrastructure calls for a centralised DNS Server (usually a DC) with forwarders configured. DHCP then points to the centralised DNS server.
                Last edited by tehcamel; 4th October 2010, 14:40.
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                • #9
                  Re: Cannot send email by using DNS to route the mail

                  He says (post #1) he has put in the EXTERNAL DNS server
                  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 **

                  Comment


                  • #10
                    Re: Cannot send email by using DNS to route the mail

                    If you are on Virgin Media cable in the UK, I would stick with the Smart Host anyway. Unless things have changed in the last few months Virgin will not give out static external IPs to business customers, which is often a cause for email being rejected by remote servers. I'd be very surprised if ALL email got bounced because of this, but though I'd share my own (rather poor) experiences of dealing with Virgin Media.
                    BSc, MCSA: Server 2008, MCSE, MCSA: Messaging, MCTS
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                    Cruachan's Blog

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                    • #11
                      Re: Cannot send email by using DNS to route the mail

                      People think they have a static IP address on virgin because it doesn't change. However it isn't a true static IP address.

                      If I was running Exchange on virgin again, then it would be using their smart host only for all email. It is the only way to guarantee the email will be delivered.

                      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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