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POP3 is Post Office Protocol, version 3. It in an email protocol that allows a user to read and delete mail from the server. It differs from IMAP in that it does not allow email to be manipulated on the server, but requires mail to be downloaded onto the client computer. POP3 is better suited for the average user using a single computer. POP3 matches how most people use email: download, read, delete; as opposed to IMAP, which reads, sorts, and makes available for download. It allows the user to easily download messages from his account by eliminating the need to manage the account size. IMAP is Internet Message (Mail) Access Protocol. It is an email protocol that allows a user to manipulate email on the server without downloading the email. IMAP allows the user can create, delete, or rename mailboxes; get new messages; delete messages; and perform search functions on mail stored on the mail server, as opposed to performing these operations on mail downloaded onto their local computer. IMAP is better suited for a user who receives mail from a single mailbox on multiple computers and who wishes to sort his messages without downloading them onto the client computer and deleting them from the server. This makes IMAP location-independent. Folders on the server is another feature of IMAP. Messages sorted into folders from one client remain available, on the server, from another client in another location. Additional educational reading:
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