How to clear qmail queue

1. First of all, check the current mail queue with the following command.

[arunlal@lintechops~]# /var/qmail/bin/qmail-qstat
 messages in queue: 2458
 messages in queue but not yet preprocessed: 18

2. In order to remove the mail queue. Stop the qmail service.

[arunlal@lintechops~]# service qmail stop

3. Once the service is stopped execute the following commands one by one

[arunlal@lintechops~]#find /var/qmail/queue/mess -type f -exec rm {} \;
 [arunlal@lintechops~]#find /var/qmail/queue/info -type f -exec rm {} \;
 [arunlal@lintechops~]#find /var/qmail/queue/local -type f -exec rm {} \;
 [arunlal@lintechops~]#find /var/qmail/queue/intd -type f -exec rm {} \;
 [arunlal@lintechops~]#find /var/qmail/queue/todo -type f -exec rm {} \;
 [arunlal@lintechops~]#find /var/qmail/queue/remote -type f -exec rm {} \;

4. start the qmail service.

[arunlal@lintechops~] service qmail stop

Check the mail queue

[arunlal@lintechops~]# /var/qmail/bin/qmail-qstat
 messages in queue: 0
 messages in queue but not yet preprocessed: 0