Mail.app can announce the subject and sender of new emails via text-to-speech voice by integrating an AppleScript in the software's preferences. The announcement follows the selected voice in the OS X Speech settings.
Once the AppleScript has been added to Mail.app's preferences, the software will immediately start announcing every mail message that comes in. This announcement is made possible through the text-to-speech voice that has been specified in your OS X Speech preferences, making it accessible to all users.
Overall, this feature is incredibly useful for those with visual impairments or those looking for a hands-free experience. The software is extremely user-friendly and customizable, providing users with the tools to tailor their email experience to their needs, making it a must-have email client for any computer user.