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Here's a look at Yahoo's mail DNS setup, as an example:
Non-authoritative answer:
yahoo.com MX preference = 5, mail exchanger = mx4.mail.yahoo.com
yahoo.com MX preference = 1, mail exchanger = mx1.mail.yahoo.com
yahoo.com MX preference = 1, mail exchanger = mx2.mail.yahoo.com
mx4.mail.yahoo.com internet address = 66.218.86.198
I severely edited this, to make it simple: See the line with the MX in it? that's the MX record. Then, later in the DNS, you see the IP address. Now, on your domain, where's that address? Is it on the firewall's exterior, or on the server itself?
You got the networksolutions part correct, that's where the servers that have those MX records are, if you need to edit them, which you probably will, if you change the mail server around. If the IP/Names are familiar, then you may own those servers. If not, then you may outsource it to your isp. check the domain on those DNS servers, and see if it's yours or someone elses.
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I'm gonna be rich and famous, as soon I invent a device that lets you stab people in the face over the internet.
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