Send a message when a comment is left I want to send a message to users that have commented on a node each time a new comment is left. 

I think I am half way there. 

I have created a component of the content type, added a loop that looks at the “node:comments” and set the email up using referenced mail list 

I have also created a rule that triggers the component on the event of a new comment.

The problem I have is that I want to exclude the node author as they get notified anyway when a new comment is left in a separate rule. 

Also, that if you have left more than 1 comment on the node you get more than 1 email so I need to filter it down. 

I am fairly new so as much detail as possible would be appricatied.

Many thanks :-)

David
How about the modules - 

Comment Notify


  Comment Notify is a lightweight tool to send notification e-mails to visitors about new, published comments on pages where they have commented. Comment Notify works for both registered and anonymous users.


or

Notify


  The notify module allows users to subscribe to periodic emails which include all new or revised content and/or comments of specific content types, much like the daily newsletters sent by some websites.


and see Email notification for new comments