shawfactor

Allows Buddypress group admins to send email and private messages to all group members from the group admin/manage section.
This plugin sends each message (PM or email) individually to each group member. And supports merge tags to personalise the message for each recipient.
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LH Buddypress Email or Message Group Members

Allows Buddypress group Admins to send email and/or a private message to all group members .

Zodor

Email All Users is a plugin that creates a widget that allows you to send mass email to all registered users in your wordpress site. 
You configure the widget with a title and mailto-link-title. 
The widget will then create a mailto:link that will include all users that is active. 
If you have the plugin “Email Users” installed it will only include users that has approved mass email in the settings.

Email All Users

Email All Users is a plugin that allows you to send mass email to all registered users in your wordpress site.

LH Buddypress Email or Message Group Members vs Email All Users