Users with the designation "Teacher" can adjust their notification preference as per their convenience for emails.
Here's a step by step guide along with a video of how to do this on Cialfo:
Step 1:
Click on your Profile picture in the top right corner and select "My settings"
Step 2
Scroll down to Notification Settings and click on the checkbox as per your preferences. You can choose to receive notifications for Recommendations on a daily (Mon-Fri) or weekly (on every Monday) basis.