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  • Problem accessing external e-mail server

    My organization is in the process of moving away from our SBS2000. One of the steps we are going through is switching our e-mail from our Exchange server to an external POP3 mail server run by our web hosting company.

    The problem I am having is the clients on domain cannot access their mail server. Their tech support tells me that it is a problem with the way DNS is setup in our server. He is telling me that the clients are set to only look at the local Exchange server for e-mail.

    To test this I pinged their mail server and the client was unable to resolve the IP address. However, I do get a response if I use the IP address. So I think that he is correct.

    How do I get SBS2000 to allow our Outlook clients to use an external mail server?

    Thank you in advance for any information.

  • #2
    Re: Problem accessing external e-mail server

    it;s got nothing to do with outlook or exchange.

    Outlook or exchange cannot affect the DNS entries.

    It's more likely a problem with the DNS altogether.

    It confuses me that it's only this site you're having a problem with.
    Can you tell us more about your environment ?
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    • #3
      Re: Problem accessing external e-mail server

      Did you ping the correct name for their mail server?
      What happens when you ping their mail server IP?
      Have you manually added the POP email details to each Outlook client?
      Are you using the same incoming and outgoing provider?
      1 1 was a racehorse.
      2 2 was 1 2.
      1 1 1 1 race 1 day,
      2 2 1 1 2

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      • #4
        Re: Problem accessing external e-mail server

        tehcamel, biggles77, thanks you for replying,


        Originally posted by tehcamel View Post

        It's more likely a problem with the DNS altogether.
        That is more or less what their tech support person told me. He said his other customers who are in a Windows environment had to make changes to their DNS, but he could not tell me how to make the changes because he was not a "Windows Guy".

        Originally posted by tehcamel View Post

        It confuses me that it's only this site you're having a problem with.
        Can you tell us more about your environment ?
        Yeah, this is the only site we are having problems with. We are running a small Windows 2000 domain (6 clients) using SBS 2000. We run everything (Exchange, ISA, SQL server, domain controller, gateway, file server) off of a single multi-homed Dell PowerEdge 1500SC.

        Originally posted by biggles77

        Did you ping the correct name for their mail server?
        What happens when you ping their mail server IP?
        Have you manually added the POP email details to each Outlook client?
        Are you using the same incoming and outgoing provider?
        Yes, I triple checked the name.

        When I ping the IP address I get a response. However, if I ping using the host name, the clients are not able to resolve the name. But, the server is able ping either way.

        I have made all the changes to Outlook as directed by the web hosting company's tech support person.

        Yes, I am using the same outgoing and incoming provider.

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        • #5
          Re: Problem accessing external e-mail server

          ok. on your workstation, open a command prompt. Do the following:

          ipconfig /flushdns
          telnet pop3.mailhost.net 110
          telnet 1.2.3.4 110

          What we're doing is:
          Removing any cached DNS Entries (In fact, flush the DNS cache on the server too for good measure)
          then we're trying to open a connection to the POP3 port (110) on the mail server, using it's hostname.
          Then we're trying to open telnet to port 110 using just the IP

          Obviously, replace the variables for hostname and IP with the right details.


          I find it AMAZING that this hosting company doesn't have a knowledge base article on this, if other customers have had the same company. At this point, I'd be seriously considering if I wanted to use them.


          Also, could you dump the output of the DNS Servers from one of the workstations?
          you can get this by doing ipconfig /all
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          • #6
            Re: Problem accessing external e-mail server

            OK, I followed your instructions and when I telnet using the host name I get an error message saying that it could not open a connection to the host on port 110. However, I am able to connect if I use the IP address.


            Code:
            C:\Documents and Settings\>ipconfig /all
            
            Windows IP Configuration
            
                    Host Name . . . . . . . . . . . . : outreach
                    Primary Dns Suffix  . . . . . . . : ourdomainname.com
                    Node Type . . . . . . . . . . . . : Unknown
                    IP Routing Enabled. . . . . . . . : No
                    WINS Proxy Enabled. . . . . . . . : No
                    DNS Suffix Search List. . . . . . : ourdomainname.com
            
            Ethernet adapter Local Area Connection:
            
                    Connection-specific DNS Suffix  . :
                    Description . . . . . . . . . . . : Intel(R) PRO/1000 MT Network Connect
            ion
                    Physical Address. . . . . . . . . : 03-19-B9-39-B9-64
                    Dhcp Enabled. . . . . . . . . . . : No
                    IP Address. . . . . . . . . . . . : 192.168.122.18
                    Subnet Mask . . . . . . . . . . . : 255.255.255.0
                    Default Gateway . . . . . . . . . : 192.168.122.2
                    DNS Servers . . . . . . . . . . . : 192.168.122.2
            Thanks again for taking the time to help.

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            • #7
              Re: Problem accessing external e-mail server

              what's the ip address of your domain controller ?
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              • #8
                Re: Problem accessing external e-mail server

                Where is DNS installed???

                Have you setup forwarders on your DNS server???

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                • #9
                  Re: Problem accessing external e-mail server

                  also, what's the hostname of the pop3 server ?
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                  • #10
                    Re: Problem accessing external e-mail server

                    tehcamel,

                    The IP address for our domain control is 192.168.122.2 and the host name for the mail server is mail.shalerems.com.

                    wullieb1,

                    DNS is installed on the domain controller. Forwarders are setup on the DNS server. Before posting I also tried adding a DNS record for the mail server in the forward look up zone.

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                    • #11
                      Re: Problem accessing external e-mail server

                      Remove the record you have created in your DNS and flush the cache again.

                      Can you do an NSLOOKUP on the name and see if your DNS is resolving the IP.

                      Non-authoritative answer:
                      mail.shalerems.com canonical name = shalerems.com
                      shalerems.com MX preference = 0, mail exchanger = shalerems.com

                      shalerems.com nameserver = ns2.cwthost.com
                      shalerems.com nameserver = ns1.cwthost.com
                      shalerems.com internet address = 207.250.188.45

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                      • #12
                        Re: Problem accessing external e-mail server

                        Originally posted by wullieb1 View Post
                        Remove the record you have created in your DNS and flush the cache again.

                        Can you do an NSLOOKUP on the name and see if your DNS is resolving the IP.

                        Non-authoritative answer:
                        mail.shalerems.com canonical name = shalerems.com
                        shalerems.com MX preference = 0, mail exchanger = shalerems.com

                        shalerems.com nameserver = ns2.cwthost.com
                        shalerems.com nameserver = ns1.cwthost.com
                        shalerems.com internet address = 207.250.188.45

                        Ok, I removed the record, flushed the DNS cache, and did a nslookup. Here's what I got:


                        Code:
                        *** Can't find server name for address 192.168.122.2: Non-existent domain
                        *** Default servers are not available
                        Server:  UnKnown
                        Address:  192.168.122.2
                        
                        DNS request timed out.
                            timeout was 2 seconds.
                        *** Request to UnKnown timed-out
                        Does anyone have any ideas what is wrong?

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                        • #13
                          Re: Problem accessing external e-mail server

                          Yes.

                          You need to have a reverse PTR entry for your name server
                          Also make sure your dns server is running on the domain controller

                          try to telnet to port 53 on the name server and see if it's running
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                          • #14
                            Re: Problem accessing external e-mail server

                            Originally posted by tehcamel View Post
                            Yes.

                            You need to have a reverse PTR entry for your name server
                            Also make sure your dns server is running on the domain controller

                            try to telnet to port 53 on the name server and see if it's running
                            Yep pretty much what you need to do.

                            However it is NOT essential that you run DNS on your DC.

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                            • #15
                              Re: Problem accessing external e-mail server

                              Surely for active directory it is (unless you go into 3rd party dns servers)
                              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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