If my email is being sent by some other user with my email address. how do i stop them ? E-mail is from user@mydomain.com I don't know how they can use my email. When you click on the link you provided you are redirected to another website.This is called email spoofing. Email spoofing is when someone sends email that looks like it came from somewhere it did not. There is no way for someone to prevent email spoofing.