Email forwarders in cPanel are stored in file /etc/valiases/domain
*Where domain is the domain name under which email forwarders are created.
To bulk delete email forwarders in cPanel you can edit this file with your favorite text editor:
The format in which email forwarders are stored is the following:
this-address-forwards-all firstname.lastname@example.org: email@example.com
and-this-one-forwards-all firstname.lastname@example.org: email@example.com
and at the end of the file don’t forget to put: