Changing mail queue life time in qmail installed with plesk

Default queue life time is 7 days. That means, your mails will be stored in queue for 7 days if it not able to deliver. 

We can reduce this queue time with following steps.

To check current queue life time:

/var/qmail/bin/qmail-showctl | grep life

Time mentioned as seconds,

To set queue life time:

echo "172800" > /var/qmail/control/queuelifetime

Here I've set queuelifetime is 2 days.

For changes to take effect

service qmail restart

or

/etc/init.d/qmail restart