Index: buddypress/bp-messages.php
===================================================================
--- /buddypress/bp-messages.php	(revision 3155)
+++ /buddypress/bp-messages.php	(working copy)
@@ -177,7 +177,8 @@
 				$autocomplete_recipients = explode( ',', $_POST['send-to-input'] );
 				$typed_recipients = explode( ' ', $_POST['send_to_usernames'] );
 				$recipients = array_merge( (array) $autocomplete_recipients, (array) $typed_recipients );
-
+				$recipients = apply_filters( 'bp_messages_recipients', $recipients );
+				
 				/* Send the message */
 				if ( $thread_id = messages_new_message( array( 'recipients' => $recipients, 'subject' => $_POST['subject'], 'content' => $_POST['content'] ) ) ) {
 					bp_core_add_message( __( 'Message sent successfully!', 'buddypress' ) );