Every marketing email now carries a working unsubscribe link and the one-click unsubscribe header that Gmail and Yahoo look for — which keeps you out of spam folders.
Campaign and journey emails always include an unsubscribe footer
Inboxes show their native “Unsubscribe” button next to your name
An email that would go out without an unsubscribe link is held, not sent
Better standing with Gmail and Yahoo bulk-sender rules