Hello!
You can export a list of contacts that marked an email as spam under the Email Tools section. Go to Marketing - Email and look on the lefthand side for Email Bounce Tools header. Click that text, and then select Export Unsubscribes and Hard Bounces. A pop up window will appear and you can delete the Unsubscribes and Hard Bounces criteria before exporting the records. Then just re-upload them as an opt-out list.
This obviously doesn’t solve for the workflow issue, but it should save some time from you manually looking everyone up.
