Need help with Scripting . . .

Now that my XScript Editor, Tester, Debugger, Extension, and function module are done i need some more help. I fixed the UCase to LCase problem and it works well . . . I need help with coming up with new functions . . . but thats off topic.

I was REALLY wondering how SMTP servers and POP3 servers talk to each other to transmit fresh emails from the SMTP server to the Inbox of an email address on the POP3 server. How is this done? Could someone give me some sample protocol?