We have too many things to log in today.
I am exploring the potential of sending a link through an encrypted email configuration to a user. The user can simply log in to his email at any time, find the email and click on the link.
The link, created when registering, is basically a hash that identifies the user. so the link is foo.com/sdf89s0i2k202j202ej20, and when they click on the link, they are automatically registered in a web application.
Are there any important concerns with this approach? I do not think I've seen it before.