An email forwarder can be deleted via the API.
- Access the server's command line as the 'root' user via SSH or "Terminal" in WHM.
- Run the following command.
uapi --username=cpusername Email delete_forwarder email@example.com' firstname.lastname@example.org'
Please note that cpusername, email@example.com, and firstname.lastname@example.org must be replaced with the cPanel username the forwarder is on, the forwarded email address, and the destination address, respectively.