How to check mail queue in qmail?

/var/qmail/bin/qmail-qstat

# nice find /var/qmail/queue/mess/ -type f | xargs grep ‘^From: ‘ | awk ‘{print $2}’ | sort | uniq -c | sort -n | tail

# nice -20 find /var/qmail/queue/mess/ -type f |xargs egrep ‘^From|^To’ |sort -k1 |uniq |sort -k2 |uniq -c -f 1 |sort -n |tail