Active Directory & Exchange

Posted on 2006-03-25
Last Modified: 2010-04-19
I've configured Active Directory and Exchange on my Windows 2003 server.  I am able to send emails out, however I'd like to also be able to receive email on my server.  

I am using a dynamic DNS service and I have a hostname created -

I'd like to be able to recieve emails on my Exchange server - so for example my email needs to be  What do I have to change on my Windows 2003 server to allow for this to happen and mail to be routed to that dynamic IP?
Question by:jpipitone
    LVL 12

    Accepted Solution

    First, this Dynamic DNS service you use must support MX DNS records. Mail Exchanger records determine to which IP-address e-mail to a particular domain is sent.

    If the DDNS service you use can't register an MX record for your domain that points to then you can't have incoming mail on that domain. Register a normal domain with a static IP address instead.

    If it is possible to have your own MX record, then all you have to do is open Exchange System Manager, find the item that says Recipient Policies, and adjust the default recipient policy to handle the domain name The recipient policy determines which e-mail addresses your Exchange SMTP server will accept, otherwise it will be blocked as a relay attempt.

    Furthermore, your TCP port 25 must be reachable from the Internet, and you want to have a decent attachment filtering and antivirus package installed.

    Simple, huh? ;-)
    LVL 1

    Author Comment

    Sounds simple enough.  I will get in touch with the DDNS service and ask if I can register an MX record - if they do, what would I have to register - a record that points to something?

    LVL 12

    Expert Comment

    Correct, an MX record never directly points to an IP address, it points to a host name, which is your ddns hostname.

    To view MX-records for a particular DNS domain, type the following on a command prompt:

    nslookup -querytype=mx

    For example, if you try that for, you will see that all SMTP mailservers in the world will deliver mail for that domain to . Try the same for and see how many mailservers they have.

    If you put in your own domain, then no mx record is returned.

    Thank you for accepting the answer, good luck.

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