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The modem/router has been configured to translate the WAN IP to the LAN IP of the web/mail server (this is verified by the modem/router company). The DNS has been set up in the web/mail server to provide name resolution and www alias. A domain name (myhost.mydomain.com) has been registered and mapped to the router's WAN IP.
Internally (inside the LAN), typing www.mydomain.com will open up the website, and internal emails can be sent/received within the LAN. But externally (outside of the modem/router), typing www.mydomain.com does not work, while typing myhost.mydomain.com works fine. Additionally, external emails cannot be sent or received.
I have tried many different ways but did not work. If anyone has ideas or thoughts, please help me! Thanks a lot.
If you give real names of domains and IP addresses, we could test it externally for you.
Hope that helps.
Neither of these appear to be properly serving domain records. If I lookup www.domain.name, it just hangs or times out. If I attempt to lookup MX records (mail exchange records, allows incoming mail for the domain, if the SMTP server is setup properly), it hangs or times out.
I can lookup the names listed above, but not the records you need. So, the maintainers of the above domain name servers need to fix their domain name servers. You have probably already done this, but you might also verify the registrar (Network Solutions) does not have any strange domain forwarding or e-mail forwarding features attached to the domain in question.
Hope this helps.