If you do not wish to receive notifications from the system, you can deactivate the e-mail option in the user settings of your profile.
Click on the username/usericon in the top-right corner of the black menu bar and select "My profile" from the menu that appears.
Once on the main page of your profile scroll down to the option "Notification" and set the radiobutton for "None":
Click «SAVE» at the bottom of the page to finish the process.