Announcement

Collapse
No announcement yet.

Cannot receive external email, using DDNS as DNS

Collapse
X
  • Filter
  • Time
  • Show
Clear All
new posts

  • Cannot receive external email, using DDNS as DNS

    Hi,

    I am using DDNS for my "DNS". The Exchange 2000 server is able to sent mail but cannot receive external mail.
    Below is the error message tested from a web email client by replying the email any idea?

    he following addresses had permanent fatal errors -----
    <[email protected]>
    (reason: 550 User unknown)

    ----- Transcript of session follows -----
    ... while talking to mx1.mailhop.org.:
    >>> DATA
    <<< 550 User unknown
    550 5.1.1 <[email protected]>... User unknown
    <<< 503 valid RCPT command must precede DATA


    Have done the following
    1) Check the DNS settings
    2) Check the SMTP port 25 by telnet

    At loss what to do. Please advise

  • #2
    Re: Cannot receive external email, using DDNS as DNS

    1. Check the connection with the AD server (if the Exchange & AD are on different servers).
    2. Try reboot the server.
    3. Check with http://www.dnsstuff.com all the DNS records, icluding MX & PTR.
    4. Check the recipient update service configuration.
    CNE 5, CCA, MCSE NT4.0-2003, MCSE 2003 messaging, Exchange Server MVP.
    Tzahi Kolber - IT Supervisor
    Polycom Israel.

    Comment


    • #3
      Re: Cannot receive external email, using DDNS as DNS

      Thank you, Kolber for replying.

      My AD and Exchange is on the same server.The recipient update service configuration is ok.
      Maybe I should be more detailed
      I am using a ADSL line connected to my ISP.
      I am using DDNS to resolve my IP (which is a dynamic IP)
      I can sent messages from my Exchange server to external emailers.
      External emailers cannot sent to me.

      A test from the link you give earlier. (Test mail)
      Getting MX record for dyn-o-saur.com (from local DNS server, may be cached)... Got it!

      Host Preference IP(s) [Country]
      mx1.mailhop.org. 10 63.208.196.167 [US]63.208.196.168 [US]63.208.196.175 [US]63.208.196.176 [US]63.208.196.165 [US]63.208.196.166 [US]
      mx2.mailhop.org. 20 204.13.250.92 [US]204.13.249.91 [US]204.13.249.92 [US]204.13.250.91 [US]




      Step 1: Try connecting to all of these (in the order as returned by the DNS resolver, per RFC1123 5.3.4):
      mx1.mailhop.org. - 63.208.196.167
      mx1.mailhop.org. - 63.208.196.168
      mx1.mailhop.org. - 63.208.196.175
      mx1.mailhop.org. - 63.208.196.176
      mx1.mailhop.org. - 63.208.196.165
      mx1.mailhop.org. - 63.208.196.166

      Step 2: If unsuccessful in step 1, try connecting to all of these (in the order as returned by the DNS resolver, per RFC1123 5.3.4):
      mx2.mailhop.org. - 204.13.250.92
      mx2.mailhop.org. - 204.13.249.91
      mx2.mailhop.org. - 204.13.249.92
      mx2.mailhop.org. - 204.13.250.91

      Step 3: If still unsuccessful, queue the E-mail for later delivery.



      Trying to connect to all mailservers:

      mx1.mailhop.org. - 63.208.196.167 [Could not connect: Got an unknown RCPT TO response: 550 User unknown
      ]
      mx1.mailhop.org. - 63.208.196.168 [Could not connect: Got an unknown RCPT TO response: 550 User unknown
      ]
      mx1.mailhop.org. - 63.208.196.175 [Could not connect: Got an unknown RCPT TO response: 550 User unknown
      ]
      mx1.mailhop.org. - 63.208.196.176 [Could not connect: Got an unknown RCPT TO response: 550 User unknown
      ]
      mx1.mailhop.org. - 63.208.196.165 [Could not connect: Got an unknown RCPT TO response: 550 User unknown
      ]
      mx1.mailhop.org. - 63.208.196.166 [Could not connect: Got an unknown RCPT TO response: 550 User unknown
      ]
      mx2.mailhop.org. - 204.13.250.92 [Could not connect: Got an unknown RCPT TO response: 550 User unknown
      ]
      mx2.mailhop.org. - 204.13.249.91 [Could not connect: Got an unknown RCPT TO response: 550 User unknown
      ]
      mx2.mailhop.org. - 204.13.249.92 [Could not connect: Got an unknown RCPT TO response: 550 User unknown
      ]
      mx2.mailhop.org. - 204.13.250.91 [Could not connect: Got an unknown RCPT TO response: 550 User unknown
      ]


      NOTE: This tool does NOT attempt to determine if an E-mail address exists!

      Comment


      • #4
        Re: Cannot receive external email, using DDNS as DNS

        Sorry if this sounds unhelpful, but I have looked at lots of threads about setting up exchange and I have gathered that trying to run Exchange on a dynamic IP is prone to trouble.

        Comment


        • #5
          Re: Cannot receive external email, using DDNS as DNS

          Any idea what's the issue with the below?
          Thanks

          C) Copyright 1985-2000 Microsoft Corp.

          C:\Documents and Settings\Administrator.GREAT-WHITE>cd\

          C:\>nslookup
          *** Can't find server name for address 192.168.0.2: Non-existent domain
          *** Can't find server name for address 10.0.0.2: Non-existent domain
          *** Default servers are not available
          Default Server: UnKnown
          Address: 192.168.0.2

          > set q=mx
          > great-white.din-o-saur.com
          Server: UnKnown
          Address: 192.168.0.2

          (root)
          primary name server = ns
          responsible mail addr = hostmaster
          serial = 1181808468
          refresh = 16384 (4 hours 33 mins 4 secs)
          retry = 2048 (34 mins 8 secs)
          expire = 1048576 (12 days 3 hours 16 mins 16 secs)
          default TTL = 2560 (42 mins 40 secs)
          >

          Comment


          • #6
            Re: Cannot receive external email, using DDNS as DNS

            Thanks Simon for your concern, as I am using this Exchange server as a training tool

            Comment


            • #7
              Re: Cannot receive external email, using DDNS as DNS

              The error you have posted above is not being generated by your server. It is being generated by mx1.mailhop.org. You will need to ask them what the problem is.

              Running Exchange on a dynamic IP address is fine. It isn't as straight forward as regular static IP address, but I ran Exchange on a dynamic IP for two years without any problems.

              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


              • #8
                Re: Cannot receive external email, using DDNS as DNS

                Originally posted by chanyha View Post
                Thanks Simon for your concern, as I am using this Exchange server as a training tool
                Sorry, i didn't mean to be unhelpful - it's just a conclusion I came too. I also plan to run exchange and have accepted i will need a non nat static block.

                Comment


                • #9
                  Re: Cannot receive external email, using DDNS as DNS

                  Thanks Simon,

                  I have wrote to the service provider.

                  Comment


                  • #10
                    Re: Cannot receive external email, using DDNS as DNS

                    Hi Guys,

                    Maybe I should fill in more info.

                    I running the exchange server 2000 with 2 NICS.
                    One connected to internal network and the other NIC direct connected to internet (which is connecting via DSL, using their NAT DHCP address).

                    Besides configure the SMTP connector for outbound mail (which is ok)
                    and put the information such as MX in the DNS (in which my server is a DC)
                    Any other suggestions ? (besides contacting the provider?)

                    Many Thanks.

                    PS: Is there a procedure you can share to config exhange server 2000 using DDNS.
                    Many thanks in advance

                    Comment


                    • #11
                      Re: Cannot receive external email, using DDNS as DNS

                      Dual homing Exchange is never something that I recommend. Windows does not make a very good router.

                      My preference would be to put a router in front of the Exchange server and have a single NIC and connection to the router.

                      However if the ISP is NATTING, then you may have a problem with getting email in anyway, as most solutions require a routable IP address, even if it isn't static.

                      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


                      • #12
                        Re: Cannot receive external email, using DDNS as DNS

                        Thanks for the Reply.
                        Managed to contact the service provider and the my exchange server is up and running.

                        Solution

                        1) Add the ISP IP mail server in the local server DNS as am MX record (inbound)
                        2) Add a SMTP outbound connector for outbound mail.
                        3) Contact the ISP if you have any error messages.

                        Thanks everyone.
                        next: Testing of Scanmail for Exchange......

                        Comment


                        • #13
                          Re: Cannot receive external email, using DDNS as DNS

                          chanyha,

                          glad you got it sorted. Perhaps you can tell us what you think of Scanmail?

                          Comment


                          • #14
                            Re: Cannot receive external email, using DDNS as DNS

                            Hi Simon,

                            Am installing it now. Perhaps we can have a new thread on Scanmail?

                            Thanks
                            Andy
                            Alias Chanyha

                            Comment


                            • #15
                              Re: Cannot receive external email, using DDNS as DNS

                              Originally posted by chanyha View Post
                              Perhaps we can have a new thread on Scanmail?
                              Please do.

                              Comment

                              Working...
                              X