What are the requirements for easy unsubscribe?

Easy unsubscribe requirements mandate one click unsubscribe functionality through List-Unsubscribe headers. Marketing messages must include headers that enable recipients to unsubscribe without visiting external pages, logging in, or taking multiple steps.

Specifically, List-Unsubscribe-Post headers enable mailbox providers to process unsubscribes via POST request when users click unsubscribe buttons in their email interface. This creates seamless unsubscription without requiring users to leave their inbox.

These requirements supplement but do not replace visible unsubscribe links in message content. Both mechanisms should be present: headers for easy provider facilitated unsubscribes and body links for users who prefer that approach. Unsubscribes must be processed within two days.