HEY is an email service designed to offer a unique and modern approach to managing and interacting with emails. It emphasizes privacy and user control over their email communication. Features include a screener to filter emails before they reach the inbox, a focus and reply later feature, thread merging, strong privacy protections without trackers, and a fresh organizational approach to categorize and prioritize emails. It's a subscription-based service aimed at providing a better email experience without ads or unwanted promotions.