Notification on Policy Update or Creation

Hi ​@AKislyakov ,
Thanks for the reply, but is it possible to send a custom notification using the Notifications Handler while making any change to any items.
For Example: I edited a policy or a term or a catalog item, and now the catalog item is in draft state and it went for review to the respective steward assigned which is already available in the One Web as a task. 
Apart from that i want to send a custom notification to the user groups using a email or a notification popup in one web itself. Is it achievable?
Appreciate your input on this.

The notification handler only receives events for completed actions. That is, once the update is published, you will receive an event and can send notification emails, but not during the review phase.