When there are multiple groups and multiple teachers in a course all teachers receive notification emails from students of all groups. The procedure I follow to assign the teacher to the group is as follow:
Settings block > Users > Groups. Once there, select the group you want to add a teacher to (list on the left), highlight it, locate the teacher in the list on the right, click on her/his name and click 'add to group'.
However all the teachers in the course receive the notifications about the assignments of the students, even if they are not in the group.
Please help me to find a solution to this problem.
The Moodle version affected by this problem is the 3.5.1+