I would like to receive only one daily e-mail notification from the forum of my courses, is it possible?

Yes, it is possible. The number of e-mail notifications can be set directly in your profile. Click on your name, which is on the top right, and choose Edit Profile under the Profile settings. Finally, select Complete (daily e-mail with full posts) in the E-mail digest type.

Watch the tutorial, clicking on the orange arrow to go forward:

(last update: 25.07.2018)