Drupal - Send email notification when admin change attribute of node

Question

I'm trying to find a way, how to create email notification. I have content type "Item" with price attribute.

First I need to add possibility to sign in some email to created content - some kind of watchdog - I don't want to be registered as a new user to be able to add email. And if admin update price of this content, I need to send email to all registered emails (registered emails only for updated content)

How can I create this watchdog? Is there any module?

Thanks a lot Martin

Answer 1

You can use rules. This module allows you to react on events.