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 .

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).

LH Buddypress Email or Message Group Members vs Contact Form 7 Group Mail