You already have! All vcita announcements and automated campaigns come with an unsubscribe link at the bottom of the message in order to comply with FTC anti-spam guidelines.

You can filter out the clients who unsubscribed from your campaigns:

1. In vcita, navigating to Clients.
2. From the filter selection on the right hand side, click Advanced.
3. Check the Unsubscribed filter.
4. You can even save this filter for later by clicking Save Filter.