http://haxy4iypxfp3svi4722e3wrto76ruqe4p7y2y4if4xgsvcpck2cf6cyd.onion/howto
Create a new e-mail address somewhere, just for this purpose, use that address exclusively for darknet activity (for example, regularly buying products from us), and forget/delete that address completely, if you think you're done with the Darknet.