ElbowRobo

This plugin is for BuddyPress, it adds a dashboard menu and a tab in the messages section. Once you navigate into the messages section and click the “Mass Messaging” tab you have access to all the options which you chose in the dashboard.
Including mass messaging to:
<ul>
<li>Members</li>
<li>Members of Groups</li>
<li>Members of Blogs (Sites)</li>
</ul>
And:
<ul>
<li>Select all buttons to allow mass messaging to all members easily.</li>
</ul>
In this page you also see ‘subject’ and ‘description’ just like on the Buddypress compose page.

Mass Messaging in BuddyPress

This works great for what I need, thanks a lot!

Great plugin

Ever wanted to send a message to many people at once? Now you can, introducing - Mass Messaging.

Augusto

Eduardo Pittol

Contact Form 7 Group Mail allows you to send messages to multiple users, according to their groups. With this plugin you can choose who (admins, editors, authors, contributors, subscribers and custom roles) are going to receive the e-mails.
The list of recipients is automatically updated, so it’s not needed to change the contact form every time a user is added or removed.
Important: it is an extension for Contact Form 7 plugin.

Contact Form 7 Group Mail

Allows you to send Contact Form 7 messages to any group (admins, editors, authors, contributor, subscribers and custom roles).

Mass Messaging in BuddyPress vs Contact Form 7 Group Mail