What are frozen emails:
Cpanel/WHM can lock down emails for several reasons because they are hazardous or can't be delivered, or they wree frozen by a locking commnad of some time. A few frozen emails are normal however after a while many frozen emails in the EXIM system can clog your email system on the entire server.
Removing frozen emails:
You may only do this if you have ROOT access to your Cpanel/WHM server and you must be logged on as root via SSH. A warning, these docs are us at your own risk. First, determine the number of frozen emails you have with this command:
exim -bp | grep -c frozen
This will produce a number of frozen emails in the exum
To remove these frozen emails use command:
exim -bpr | grep frozen | awk {'print $3'} | xargs exim -Mrm
You should see your emails delete one by one.
OK...now re-issue the command
exim -bp | grep -c frozen
You should see that the number listed is smaller. SUCCESS.
We recommend now resetting exim to see if it restarts cleanly:
service exim restart
DONE......your mail queue should run much smoother now.