The company is introducing a new feature that allows users to manage all suppressed recipients for a specific message stream in one place. The new feature includes a `Suppressions` tab within each message stream, which shows inactive addresses and the reason why they are inactive, as well as a button to reactivate them. Users can also manually add recipients to the suppression list and view detailed information about individual email addresses. Additionally, the company has released a brand new `/suppressions` API endpoint to manage suppressed recipients via the API, allowing users to get a list of all suppressed addresses, add addresses to the suppression list manually, and remove eligible addresses from the suppression list.