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            PASS string             pass_(string)
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            DELE msg                dele(msg)
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            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()
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    Raises one exception: 'error_proto'.

    Instantiate with:
            POP3(hostname, port=110)

    NB:     the POP protocol locks the mailbox from user
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         'TOP': [], 'LOGIN-DELAY': ['0'], 'AUTH-RESP-CODE': [],
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