What is the difference between POP3 and IMAP?
POP3 stands for the Post Office Protocol, revision 3. IMAP stands for the Internet Mail Access Protocol. Like POP3, IMAP allows e-mail reader programs to retrieve their e-mail from the server. Unlike POP3, IMAP also provides support for keeping your mail in several folders on the server, so you can organize it more easily. If you want to allow e-mail readers to access their mail with IMAP, you should enable the IMAP service on your Aries. In that case, you will usually want to enable the POP3 service as well.