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            USER name               user(name)
            PASS string             pass_(string)
            STAT                    stat()
            LIST [msg]              list(msg = None)
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            RPOP name               rpop(name)
            APOP name digest        apop(name, digest)
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            UIDL [msg]              uidl(msg = None)
            CAPA                    capa()
            STLS                    stls()
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    NB:     the POP protocol locks the mailbox from user
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            the messages, and quit, each time you access the
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            POP is a line-based protocol, which means large mail
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         'TOP': [], 'LOGIN-DELAY': ['0'], 'AUTH-RESP-CODE': [],
         'EXPIRE': ['NEVER'], 'USER': [], 'STLS': [], 'PIPELINING': [],
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