POP3 servers without the optional APOP command expect the client to log in with the USER and PASS commands:

C: USER mrose S: +OK User accepted C: PASS tanstaaf S: +OK Pass accepted

Comparison with IMAP

The Internet Message Access Protocol (IMAP) is an alternative and more recent mailbox access protocol. The highlights of differences are:
* POP is a simpler protocol, making implementation

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