remove
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... state--the server should close the TCP connection without
removing any messages or sending any response to the client.
...
... POP3 server then acquires an exclusive-
access lock on the maildrop, as necessary to prevent messages from
being modified or removed before the session enters the UPDATE state ...
... Discussion:
The POP3 server removes all messages marked as deleted from
the maildrop. It then releases any exclusive-access lock
...
... not be counted twice, since the POP3 client will remove all byte-
stuffed termination characters when it receives a multi-line
response.
...