With the move to Microsoft Online for faculty/staff Exchange email came a new system for managing junk email, and a new feature called Clutter.
Instead of email digests, spam email is now moved to a Junk Email folder within your Exchange mailbox. More information about Exchange junk email filtering is available at https://support.office.com/en-ie/article/Overview-of-the-Junk-Email-Filter-5ae3ea8e-cf41-4fa0-b02a-3b96e21de089
Clutter is a new feature that attempts to sort low priority emails.
Clutter learns from your actions to determine the messages you are likely to ignore. As less important messages arrive, they are automatically moved to the Clutter folder. Clutter does this by leveraging Office Graph’s sophisticated machine learning techniques to determine which messages are Clutter. It gets smarter over time, learning from your prior actions with similar messages, and assessing things like the type of content and even how you are addressed in the message. The Clutter experience is personalized to each individual and reflects an email experience that adapts to your actions and preferences without you having to do anything. The information Clutter learns from each user’s actions are only applied to that user’s experience and are not shared with anyone else. –De-clutter your inbox in Office 365
If you wish to use Clutter it is important to check your Clutter folder often while it is learning what emails are likely to be less important. There is also an option to disable Clutter if you don’t wish to use it. More information, including how to turn Clutter off, is available at https://support.office.com/en-in/article/Use-Clutter-to-sort-low-priority-messages-in-Outlook-2016-for-Windows-7b50c5db-7704-4e55-8a1b-dfc7bf1eafa0