[otrs] Send an email when i note is add.

Dear all, I need to send an email to the customer and Agent, when one agent add an external note for the ticket, to inform them, i do that : Name: Notify new note Destination Group: Agent and customer Event: ArticleCreate Article type: External Note Notification subject: New note Text : You have a new note for the ticket … But that not work, I have no mail send Thanks Sébastien Bory