cmd_status cmd_uidl : 2; /* optional command UIDL */
cmd_status cmd_top : 2; /* optional command TOP */
cmd_status cmd_user : 2; /* optional command USER */
cmd_status cmd_uidl : 2; /* optional command UIDL */
cmd_status cmd_top : 2; /* optional command TOP */
cmd_status cmd_user : 2; /* optional command USER */