

This extension provides a list of projects I'm working on, and I pick Mars Remote Office. The first thing you notice is a button for the Big Secrecy Extension in the Mail compose window. I want to send a message to my colleague Seth for an update on our new remote office on Mars. To help preserve secrecy of our projects, we are using a Big Secrecy Extension that validates recipients of a mail message. Imagine I am working for a large multinational corporation where all my colleagues are collaborating on multiple highly secretive projects.

Before we dive in to build a Mail extension with these capabilities, let's go through an example of one in use. They are stable and will continue to work as the OS and Mail app change over time. This provides a full suite of Mail extensions to help compose messages, take action on incoming messages, block undesired mail content and provide encryption and decryption. Finally, message security extensions can provide further security by signing, encrypting, and decrypting messages when people send and receive mail. Content blocking extensions provide WebKit content blockers for Mail messages. Action extensions help people manage their inbox by providing custom rules on incoming messages. First, compose extensions will allow new workflows when composing mail messages. We are introducing four new ways you can extend Mail's user experience. Plug-ins will stop functioning in a future macOS release. Mail extensions are the future of extending Mail. Like other app extensions, they can be in any properly signed Mac app, can be bundled in your existing apps, and can also be distributed in the App Store. MailKit APIs are well documented and will be supported across major macOS releases. They are built with user privacy and security in mind in mind from the ground up.
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These extensions are built on the same underlying foundation as other app extensions like Safari app extensions and share sheet extensions. In macOS Monterey, we are shipping a new framework, MailKit, for building Mail extensions. I'm Abhilash, and along with my colleague, Seth, we are going to walk you through how to build great Mail app extensions. Mail is a crucial application, and Mail app extensions will let you enhance it in some incredible new ways.
