Isn't that just a webserver to handle the click and a header in the email List-Unsubscribe-Post: List-Unsubscribe=One-Click That shouldn't be hard for any

Isn't that just a webserver to handle the click and a header in the email List-Unsubscribe-Post: List-Unsubscribe=One-Click That shouldn't be hard for any mailing list manager software to handle.