| (I) An Internet Standard protocol [R1939] by which a client
workstation can dynamically access a mailbox on a server host to
retrieve mail messages that the server has received and is holding
for the client. (See: IMAP4.)
(C) POP3 has mechanisms for optionally authenticating a client to
a server and providing other security services. (See: POP3 APOP,
POP3 AUTH.)
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