[Phpwm] linkedin group is now open

[Camilo Mesias]

I think the trouble is, it's too easy to create opportunities for
denial of service if there isn't some kind of authentication backing
up a request to subscribe or block mailings. Imagine if someone could
impersonate you, on a website, and simply ask for no more mails to be
sent to you - when you are a keen user of that site.

Authentication usually comes from email based interactions that
establish a relationship between the site and the user. So there is a
chicken and egg type problem if you want to unsubscribe without
establishing a relationship with the service...


-Cam