Apple Mail is an email client included with the operating systems macOS, iOS and watchOS by Apple Inc. Developed by Apple
License: Free
Thunderbird is a free, open-source email client known for its strong customization and cross-platform support, making it suitable for users who value flexibility and privacy. Apple Mail, on the other hand, is designed for users within the Apple ecosystem, offering seamless integration and a user-friendly interface, but lacks the extensive customization options available in Thunderbird.