User Story: .

Refactor

Allow multiple accounts to email relationship
Make the combination of ID and email unique.

By subscribing to a site, a user will get notified of the latest activity on that site.

Readers:

Readers can subscribe to a site only by providing their email address. (Designs)

They will be able to create an account as well if they wish to be more than readers (commenters or site owners/ authors).

The notifications for email will only consist of subscribed site activity.

Readers can unsubscribe from a link in their emails.

Commenter:

Users who create an account can sign up to receive email notifications about their own account activity and subscribed site activity. (Designs)

They can configure their email settings, which will consist of:

Mentions
Replies
Subscribe site activity

Owner/Author

Content creators that want to receive email notifications about their own account activity, subscribed site activity and their authored content activity. (Designs)

They can configure their email settings which will consist of:

Mentions
Replies
Subscribe site activity
Activity for document they have authored