One of our teachers reported the following issue.  The teacher will often send a message to all students in his class by going to Participants > Select All > Send message.  When any teacher does this, they are selected as a participant along with their students.  The students in the class receive an email notification of the message, but the teacher does not.  I've confirmed this happens with other Moodle accounts, not just the one that reported the issue.

Steps to reproduce:

1. Create course with at least one teacher and one student.
2. Login to the course as the teacher.
3. Go to Participants > Select All > Send message.  Enter message text and send.
4. Confirm that an email notification was not send to the teacher.

Because the teacher is a participant and was selected, one would expect an email notification for the message to be sent.  This is how Moodle functioned before our site upgraded to version 3.6.1.