you would have to write your own extension to make this happen
currently there is no 'group' support for an email notice. and only the configuration for individual users on selected events. (see the email configuration in the users profile page).

the ugly part of the extension is the configuration. to make it human manageable, you want a UI, so you have to write an 'aspect editor' which contains all the UI operations. this will have to be installed on all the Eclipse client machines where this configuration process is done.
I find this part extremely difficult.  (I HATE UI development)

you 'could' edit the XML source instead, (which is what the Aspect editor would do for you), but the user requires more training, and can make some pretty big impact mistakes.

Sam