Mass Mail - Unsubscribe vs Complaint
Unsubscribe – Registrant has clicked the Unsubscribe (Opt-Out) link on a mass mail.
Complaint – Registrant has clicked the Spam/Junk button with their ISP.
Lasso is signed up on the Complaint Feedback Loops with the major ISPs (e.g. AOL, Hotmail, Yahoo, etc.). When a Registrant clicks Spam/Junk, Lasso receives a complaint email and automatically opts out the Registrant.