Emails to domain not routed to external Server

Discussion in 'DNS Server' started by Anthony Smith, Aug 7, 2007.

  1. Good Morning Costas & Everyone else!

    I hope everyone is doing well today. Thanks again for the reply. Yes the
    DMZ server is a standalone and not apart of a domain and doesn't have Active
    Direction Installed nor does it have DNS installed. Windows 2003 Std R2
    being used as a webserver with IIS 6 installed. We own two seperate domains
    but only 1 is hosted by us, the other one is by an ISP.

    On SBS, I set up an A record stating pointing to the
    external webserver. Then set up an MX record called
    pointing to the host a record Intially I did NOT
    create an A host record, just created an MX record called pointing to the IP address of the external mail

    Sorry again for the confusion!
    Anthony Smith, Aug 13, 2007
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  2. Anthony Smith

    Costas Guest


    I can't tell why the emails do not go through. If you have setup forwarders
    on your DNS, any query not resolved locally will be forward to the ISP DNS.
    Personally I wouldn't have setup a forward lookup zone locally, but as you
    said, if you don't do that, there is no server resolution, which is strange.
    The DNS, in my opinion, other than the one that manages the internal network
    should be somewhere outside your router/firewall.. e.g. ISP.

    If you have the DNS for the DMZ server at the ISP, with a WWW record that
    points to the web site run on the DMZ, and an MX record that points to the
    ISP server, I don't see why users from the local network can not send emails
    to that server.

    Sorry I couldn't be of more help

    Costas, Aug 13, 2007
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  3. Thanks for the effort. Have a blessed day!
    Anthony Smith, Aug 13, 2007
  4. I had the exact same problem that you did. I had to set up the internal DNS
    zone for the domain in question since internal users had to know where to get
    the www A record. At first I did not set up an MX record and could not get
    mail to go through. Then I set one up to point to the external mail server
    address and it still did not work. My problem was that the hosting service
    used a strange setup and I did not have the correct FQDM of the mail server
    in my MX record.
    Marty Shifflett, Aug 15, 2007
  5. So how are you users getting their email? Are you running Exchange 2003
    internally? Are you Pop'ing the mail from the external server? Please
    explain how the users are getting their external mail. Thanks.
    John Oliver, Jr. [MVP], Aug 15, 2007
  6. Thanks for the reply. That's interesting. I think the hosting server
    doesn't have an extention like, I think they just
    have and that's it.
    I tried putting in the 1st box for the name then
    using the IP address of the external mail server as the FQDM, but of course
    that hasn't worked.
    Anthony Smith, Aug 15, 2007
  7. Thanks for the reply. Users are getting mail through web browser, accessing
    the external mail. We use Exchange 2003 for domain 1. Domain 2 is the
    problem. Domain 2, the website is hosted internally but the mail is on an
    external server and it is NOT an Exchange server, it's called NeoMail (the
    webmail interface).
    Anthony Smith, Aug 15, 2007
  8. Anthony,

    I have read the thread entirely and have good understanding of what your
    issue is. Can you test by performing a telnet to port 25 from any
    workstation to the Neo Mail SMTP server ( )? Can you
    also test from the SBS Server? Do you get a response? We first need to
    insure you can at least talk to their SMTP server on port 25.

    John Oliver, Jr
    Exchange MVP 2007
    Microsoft Certified Partner
    John Oliver, Jr. [MVP], Aug 15, 2007
  9. Good Morning,

    Thanks for the reply. Yes. I can telnet port 25 and it
    works from both the workstation and from the server. I think the external
    mail server is running ESMTP Sendmail. I get the 220 message and I can type
    in EHLO and I get the Hello message.

    What else would you like for me to do?
    Anthony Smith, Aug 16, 2007
  10. Anthony,

    Can you remove any instances of internal MX Records pointing to No need for having these since these are external DNS
    records that do not need resolution internally as it relates to Exchange.
    This NDR error in a previous post "Could not deliver the message in the time
    limit specified. Please retry or contact your administrator" tells me that
    the Exchange Server is not able to communicate with the Sendmail server or mail server. Can you email me both domain names in
    question so I can check the DNS Records? Are you using the POP3 connector
    or SMTP for your Exchange Server?

    John Oliver, Jr
    Exchange MVP 2007
    Microsoft Certified Partner
    John Oliver, Jr. [MVP], Aug 16, 2007
  11. Good Morning,

    I sent you an email did you get it?
    Anthony Smith, Aug 21, 2007
  12. Anthony,

    I did not get, can you send again to . thanks.

    John Oliver, Jr
    Exchange MVP 2007
    Microsoft Certified Partner
    John Oliver, Jr. [MVP], Aug 21, 2007
  13. I sent it again, let me know if you get it.
    Anthony Smith, Aug 22, 2007
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