Best way to send mail to a slice list of author

Hello,

I'm building a website with 2 kinds of users in it.

I've created 2 roles: Clients and Professionels.

Professionnels are able to create node type: 'Services' with a particular Taxonomy called: 'Type'
Clients are able to create node type: 'Call4Service' having the same Taxonomy as previous: 'Type'

I'm trying to find a solution with rules for this things:

For example, I'm a client and I create a 'Call4Service' in a particular Taxonomy.
When I save it, I want the system to find all the node of type 'Services' in the taxonomy chosen and send a mail to their author (Professionels users).

Do you see what I mean ? (sorry for my bad english!)

Thanks!