To help email marketers see whether other groups were using their systems to spam customers, Google also said Thursday that it was piloting a new reporting, or feedback loop, program. Companies must comply with Google's bulk sender guidelines to be eligible for the pilot.
The unsubscribe button is one of a series of Gmail "quick action buttons" introduced for use in emails. Some of those shortcuts include tools for changing restaurant reservations, launching Google Docs files and responding to event invitations.
Google made another big move to filter the Gmail inbox last year, separating emails into different inboxes for categories such as Social and Promotions. Users can opt out of that organization method.