Since GP says it was a POP3 server, I suppose you would set up an email account in your client with its inbox server pointing to that POP3 server. When the clie

Since GP says it was a POP3 server, I suppose you would set up an email account in your client with its inbox server pointing to that POP3 server. When the client requests the content of the inbox, the server responds with a list of "emails" that are really just files with some email header slapped on; so your email client's inbox window essentially becomes a file browser.