Qmail Command to manage Mails

1) How to check Queue Status

/bin/qmHandle -l                                        #check all mail details in queue
/bin/qmHandle -s                                       #check all mail count in queue
/bin/qmHandle -m$messageID                 #Read message in mail queue
/bin/qmHandle -d$messageID                  #Delete message in mail queue
/bin/qmHandle -f$Sender_Address           #Delete message in mail queue