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:
nano /etc/valiases/domain.com
The format in which email forwarders are stored is the following:
from: to
*: username
for example:
this-address-forwards-all emails@domain.com: to-this-one@domain.com
and-this-one-forwards-all emails-also@domain.com: but-to-this-address@domain.com
and at the end of the file don’t forget to put:
*: username