Sending Message to Client

I have set up a project, assigned a client to it with a user inside that client. When I go to post a message to that project the only email notification options are me (site owner) and my company.

How can I have messages automatically email to the client company?

Sorry if I'm missing something obvious here…

Sorry, solved my own problem. I had assigned only the client company to the project and not the client user.

Jeremy Douglas Media Design | Twitter