POP3 and SMTP
POP3 and SMTP allow you to use the email client of your choice. With MySite's webmail offering you can access your email anywhere you have an internet connection. If you are on your personal computer you can use an email client such as Outlook, Thunderbird, Eudora, Mac Mail etc to connect to MySite's email servers. If you are on the run, you can still access your email through a web browser.
POP3 (Post Office Protocol) is a client/server protocol where email is held for you on a server. Periodically you (or your email client) will check the server and download any email. Most commonly POP3 is designed to delete the email off the server once it has been downloaded. However, it is common download your email and store a copy on the server.
SMTP (Simple Mail Transfer Protocol) is used to send and receive email. Commonly users (or their email client) will send email to their mail server through SMTP. The server will then forward the email to the proper destination through SMTP. The recipient will then usually download the email through POP3 or IMAP.