Anonymous users email subscriptions to node updates How can I achieve the following:

I want to be able to notify the anonymous user by email when I update a node.

Example: I have `mysite.com/cool-page. I want to have a block with an email field so users can subscribe basically to that page. And every time I update the content from that page, I want the subscribed users to be notified by email.

With Rules I managed to set something up so every time my node is updated it will send an email to users of a role. The problem is that I want to send an email to a list from the database (that I previously collected in a subscription block).

I use Drupal 7.
You could try the MailChimp Subscriptions module. It won't let you subscribe to individual pages, but instead to node authors. (Never tested that)

Another way, might be to use the Simple Subscriptions module and to write some custom code to achieve exactly what you want.