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File: //usr/lib/python3.7/__pycache__/poplib.cpython-37.pyc
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            USER name               user(name)
            PASS string             pass_(string)
            STAT                    stat()
            LIST [msg]              list(msg = None)
            RETR msg                retr(msg)
            DELE msg                dele(msg)
            NOOP                    noop()
            RSET                    rset()
            QUIT                    quit()

    Optional Commands (some servers support these):
            RPOP name               rpop(name)
            APOP name digest        apop(name, digest)
            TOP msg n               top(msg, n)
            UIDL [msg]              uidl(msg = None)
            CAPA                    capa()
            STLS                    stls()
            UTF8                    utf8()

    Raises one exception: 'error_proto'.

    Instantiate with:
            POP3(hostname, port=110)

    NB:     the POP protocol locks the mailbox from user
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            the messages, and quit, each time you access the
            mailbox.

            POP is a line-based protocol, which means large mail
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        zDELE %s)r4)rr?rrr�dele�sz	POP3.delecCs
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        >>> c.capa()
        {'IMPLEMENTATION': ['Cyrus', 'POP3', 'server', 'v2.2.12'],
         'TOP': [], 'LOGIN-DELAY': ['0'], 'AUTH-RESP-CODE': [],
         'EXPIRE': ['NEVER'], 'USER': [], 'STLS': [], 'PIPELINING': [],
         'UIDL': [], 'RESP-CODES': []}
        >>>

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