NOTE SENT [NAME|COUNT|USERS] <f.nick!f.name@host> [RM]
Displays host and time for messages which are queued without specifying
any password. If no option is specified SENT displays host/time for
messages sent from your nick and username.
NAME displays host/time for messages sent from your username
COUNT displays number of messages sent from your username
USERS Displays the number of messages in [], and names for all users
who have queued any message which matches with spec. nick/name/host.
RM means that the server removes the messages from the specified user.
Note that the SENT USERS command is only available to IRC operators.