How to delete all mail in queue for cPanel exim

I ran into an issue where a user was spamming and queue up thousands of email in our cPanel server. To clear it out, I did this:

/etc/init.d/exim stop

exim -bpru | awk {'print $3'} | xargs exim -Mrm

or

exim -bpru|grep frozen|awk {'print $3'}|xargs exim -Mrm

/etc/init.d/exim start

I had about 120k emails in queue and it took about 20 seconds to remove them all. If you want to fine tune it, you can have exim delete only specific emails in queue:

grep -lr 'a certain string' /var/spool/exim/input/ | \sed -e 's/^.*\/\([a-zA-Z0-9-]*\)-[DH]$/\1/g' | xargs exim -Mrm

Credit to: http://bradthemad.org/tech/notes/exim_cheatsheet.php
 

To delete frozen emails from a specific email address:

exiqgrep -i -f luser@example.tld | xargs exim -Mrm

If you just want to delete mail queue directories, sometimes faster delete:

/var/spool/exim/input and the /var/spool/exim/msglog directories

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