Hey @Maxwell 

Thanks for posting another great question!

When you create a sunset flow  it will allow you to identify profiles who are unengaged with your marketing. However it will not automatically suppress the profile. You will need to create a new segment that leverages the tag you give to unengaged subscribers who go through your sunset flow and have not opened or clicked a message lately: 

• Properties about someone > Unengaged is true AND
• What someone has done (or not done) > Opened email zero times in the last 90 days AND
• What someone has done (or not done) > Clicked email zero times in the last 90 days

You will need to monitor and periodically suppress this segment. Do so whenever you perform your regular list cleaning — at least two to three times a year is recommended. To do this:

1. Click the Manage Segment dropdown.
2. Select Export Segment to CSV.
3. Navigate to the Profiles tab.
4. In the upper right-hand corner, click Suppressed Profiles.
5. Click Upload File to upload this CSV file. 
6. You can also exclude this segment from all of your campaigns in the interim to ensure that you don't email anyone who is not engaged.

Hope this helps!