Addy.io is a platform that allows users to protect their real email addresses by using email aliases. Users can register a username and then create aliases on the platform. These aliases can be used when signing up for websites or newsletters, ensuring that the user's real email address remains private. Users can manage their aliases, activate or deactivate them, and even delete them if they start receiving spam. Anonaddy.io also offers features like mobile apps, browser extensions, GPG/OpenPGP encryption, custom domains, and the ability to reply to and send emails from aliases. The platform offers different pricing plans with varying features, including additional usernames, custom domains, etc.