With this command you can see the Queue-Lifetime:
/var/qmail/bin/qmail-showctl | grep life
this returns the Lifetime in seconds. (Default is 604800 seconds or 7 days)
You can change this value by edit the queuelifetime file in /var/qmail/control:
echo 86400 > /var/qmail/control/queuelifetime
and then restart the Qmail:
/etc/init.d/qmail restart
