Click on the Forwarders link
in the Mail Menu area.
Click on the
delete button 
next to the forwarder that you want to delete.
Delete an email forwarder when you no longer need it. There is no way to modify an email forwarder - if you have made a mistake, simply delete the forwarder and start again.
To delete an email forwarder:
Click on the Forwarders link
in the Mail Menu area.
Click on the
delete button next to the forwarder that you want to delete.