POP3 and IMAP
POP3 (Post Office Protocol Version 3) is the popular mail server protocol that is used to retrieve Email from a mail server. On some servers, IMAP4 (Internet Mail Access Protocol Version 4) is replacing POP3. Client-side programs such as Eudora and Microsoft Outlook can be used to receive Email via POP3 or IMAP4. Some examples of POP3 server programs include Microsoft Exchange (on Windows NT or Windows 2000 and 2003) and sendmail (often seen on UNIX machines).
POP3 uses port 110; IMAP uses port 143.
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