Team Tasks Notifications

Hello,

I have a user who does not want everyone in their team to receive a notification whenever a comment is added to a task, and instead, the notification should only be sent to the person assigned to the task.  I know that each individual user can update their preference so they only get replies to their comments but is there a setting for the entire group so the group does not get emailed without each person having to update their account?  I have searched through several discussions and I cannot find a solution other than walking several users through updating their preferences.  A secondary question, is there a way to stop the email from going to the Group's email box?  If the individuals are getting email, there is no need for this email to also go to the actual Group's shared email.

Thanks in advance.