Steven Brown

var pop3 = function pop3() {
    var socket;
    var writeSocket = function writeSocket(command) {
        socket.writeString(command + "\n");
        socket.flush();
    };
    var readSocket = function readSocket() {
        return socket.readLine();
    };
    return {
        // Connect to the server, if no port is specified the default 110 is used
        connect: function connect(host, port) {
            socket = new Jaxer.Socket();
            if (!port) {
                port = 110;
            }
            socket.open(host, port);
            readSocket();
        },
        // Log into the server
        login: function login(username, password) {
            writeSocket("USER " + username);
            readSocket();
            writeSocket("PASS " + password);
            readSocket();
        },
        // Performs the stat command and returns the raw result
        stat: function stat() {
            writeSocket("STAT");
            return readSocket();
        },
        // Returns the number of emails in the account
        count: function count() {
            return this.stat().split(" ")[1];
        },
        // Gets the size of an email (if MailNum passed)
        // Otherwise gets an array of all emails and their sizes
        // Note the array index is the number of the email and starts at 1
        list: function list(mailNum) {
            if (mailNum) {
                writeSocket("LIST " + mailNum);
                return readSocket().split(" ")[1];
            }
            writeSocket("LIST");
            readSocket();
            var mailList = [];
            while ((inLine = readSocket()) !== ".") {
                var parts = inLine.split(" ");
                mailList[parts[0]] = parts[1];
            }
            return mailList;
        },
        // Gets the unique identifier of an email (if mailNum passed)
        // Otherwise gets an array of all emails and their unique identifiers
        // Note the array index is the number of the email and starts at 1
        identify: function identify(mailNum) {
            if (mailNum) {
                writeSocket("UIDL " + mailNum);
                return readSocket().split(" ")[2];
            }
            writeSocket("UIDL");
            readSocket();
            var mailList = [];
            while ((inLine = readSocket()) !== ".") {
                var parts = inLine.split(" ");
                mailList[parts[0]] = parts[1];
            }
            return mailList;
        },
        // Return the size of an email in bytes
        size: function count(mailNum) {
            return this.list(mailNum).split(" ")[2];
        },
        // Get an email
        retrieve: function retrieve(mailNum) {
            writeSocket("RETR " + mailNum);
            readSocket();
            var mailContent = "";
            while ((inLine = readSocket()) !== ".") {
                mailContent += inLine + "\r\n";
            }
            return mailContent;
        },
        // Deletes an email, we can't call it delete because that's a reserved word
        // You will need to disconnect in order for the email to be deleted
        remove: function remove(mailNum) {
            writeSocket("DELE " + mailNum);
            return readSocket();
        },
        // "Undelete" any emails marked for deletion
        reset: function reset() {
            writeSocket("RSET");
            return readSocket();
        },
        // Send the "QUIT" command (to delete any emails marked for deletion) and disconnect
        disconnect: function disconnect() {
            writeSocket("QUIT");
            readSocket();
            socket.close();
        }
    };
};

var pop = pop3();
pop.connect("yourhost");
pop.login("youruser", "yourpass");
var mailCount = pop.count();
var uniqueIds = pop.identify();
for (var i = 1; i <= mailCount; i++) {
    var myFile = new Jaxer.File(Jaxer.Dir.resolve(Jaxer.request.currentFolder + "/mail/" + uniqueIds[i] + ".txt"));
    if (!myFile.exists) {
        var mail = pop.retrieve(i);
        myFile.open('w');
        myFile.write(mail);
        myFile.close();
    }
}
pop.disconnect();