In order to cancel your service, you must cancel the Payment Profile that you have with us through Paypal.
Go to the Automatic Payments section in your Paypal account. Here's a direct link to that section: https://www.paypal.com/us/cgi-bin/webscr?cmd=_manage-paylist
We do not handle cancellation via email.
Here are the steps to find the Automatic Payments section in PayPal when logging in on your Desktop/Laptop.
(Note: you can't do this via the PayPal mobile app or using PayPal.com on your phone)