Lately you may have seen a new set of emails delivering to your inbox like below:
This email will be generated to you if you have the 'Manage Content' permission to a certain folder.
You can manage these emails however.
Please scroll to the lower part of the email. There you will see 'Manage Email Settings'
Click on that.
From there, you will have the option to choose how often you would like new content had been ingested to that folder or change to never be notified.
Please remember to hit the 'save' button after you have made your changes.