WPMU DEV BuddyPress Group Email plugin adds the feature of sending emails to a whole group. Admins can send emails to all the members of a group with just one click and the admins do not have to search for individual emails. Emails are also delivered even if the notifications of the members are turned off. It is a simple yet useful plugin for BuddyPress users.
This is the EXACT same plugin as distributed by the developer on WPMU DEV. The developers’ links are provided above.