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About the MX record: Your company has a domain (yourdomain.com) that you registered with networksolutions. When you registered, you told networksolutions which DNS servers had the original info about the domain (where the mail server, web server, etc. are) that's called the Start Of Authority (SOA). Now, on those servers (which you can see by doing a whois lookup on your domain), you have a domain file, that contains the IP address of your mail server. It's indicated by the MX name in the line. The MX record will have a host name, and there will be a host record (indicated with an A on the line), for the host's IP address. That IP has to be either: a) The Ip address of the mail server, if it's directly connected, or b) pointing at the outside address of your router, and your router does a passthrough to the internal ip address of your mail server.
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