App that makes it is possible to email the right users, by letting the issue type define who gets a notification.
The notification schemes are mapped through an Issue Type notification scheme. You can create new schemes and associate them to projects as you normally do.
An Issue type notification scheme is basically a set rules that maps an Issue Type to a traditional notification scheme. You can also set the default notification scheme to use if no rule is set for an issue type.
The menu item is located just below where you normally find Notification Schemes in the administration section.