List-Unsubscribe is an email header that enables unsubscribe buttons in inboxes. Learn how it works and why it improves compliance and deliverability.
List-Unsubscribe is an email header that makes it easier for recipients to unsubscribe from mailing lists. Many inbox providers display an unsubscribe link or button near the subject line when they detect a valid List-Unsubscribe header.
This feature improves user experience and can reduce spam complaints because recipients have a clear alternative to clicking “Mark as spam.” It also supports compliance by making opt-out simpler and more visible.
If you send marketing or bulk messages, adding List-Unsubscribe is often considered a best practice. Make sure the unsubscribe mechanism works reliably and that opt-out requests are honored quickly.