Post with e-mail only (without password)

Currently there is an option to sign in with e-mail and password or to allow anonymous postings. There should be a third option to allow new submissions or upvotes with e-mail address only.

1. Users can add submissions or vote without registration, but they have to enter an e-mail address

2. An email is sent to them, and they have to confirm the action with a link which is sent in the mail