# pgrep -lf "Queue runner" 12443 sendmail: Queue runner@01:00:00 for /var/spool/clientmqueue
You can change it editing /etc/sysconfig/sendmail (ie. set 30 minutes):
DAEMON=yes
QUEUE=30m
It’s easy, isn’t it? Useful for mail backup MXs that may need shorter queue run times.REFERENCES
http://rambleon.usebox.net/post/317857580/change-the-queue-runner-interval-in-sendmail