Clutter is a feature in Office 365 designed to help users focus on the most important messages in their Inbox by moving lower priority messages out of their way and into a new Clutter folder. Exchange Online keeps track of the emails users read and the ones they don't read. Once it is turned it on, Clutter is automatic. As new email comes in, it takes messages users are most likely to ignore and puts them into the Clutter folder. The more users use it, the better it gets.
For organizations, it is important to ensure that certain messages do not end up in users’ Clutter folders. These could be messages from the CEO, from the HR or Finance departments, from the ServiceDesk, etc. In order to ensure this is the case, we need to create a transport rule that makes sure that these messages bypass the clutter folder.
We can do this by using PowerShell to create a rule similar to the following for example:
New-TransportRule -Name “Bypass Clutter” –From email@example.com -SetHeaderName “X-MS-Exchange-Organization-BypassClutter” -SetHeaderValue “true”
Please note that both “X-MS-Exchange-Organization-BypassClutter” and “true” are case sensitive!
If we prefer to use the UI, the transport rule will look like this: