Hey (email service)

The service may be accessed through the HEY website and through apps for macOS, Windows, Linux, Android and iOS.^[5][6] Due to the service's vertical integration, a HEY mailbox cannot be incorporated into other email services or stand-alone email clients.^[7]

Around the time of HEY's launch, a stand-off between 37signals and Apple Inc. over Apple's policy on in-app purchases in apps hosted by its App Store was the cause of significant media attention upon Apple's policies.^{[8][9][10][11]}

• An email from a new sender requires the user to confirm whether they wish to receive emails from that sender, and if not then emails from that sender are never shown again^[6]
• Blocks tracking pixels (called a spy tracker in the apps) and informs the user if an email includes tracking^[6]
• A single place showing all attachments that have been received, regardless of sender^[6]

• Mailbox provider