As I run my own mail server, what I do is always creating an alias, usually named after the website I subscribe. Like expedia@mydomain.com for example. This wa

As I run my own mail server, what I do is always creating an alias, usually named after the website I subscribe. Like expedia@mydomain.com for example. This way I can stop unwanted mail if unsubscribe does'nt work by deleting the alias. It also help to see who is selling your email. For example, some years ago, I had the problem with bitdefender, as I subscribed as a reseller (!). I explained what I thought about it to my sell representative, who couldn't find a decent explanation. And stop selling their product. And destroy the alias.