Mimestream is a native macOS e-mail client for Gmail. The application combines your favorite Gmail features with the power of a native macOS app so you can move through your e-mail effortlessly. Instead of using the IMAP protocol, Mimestream uses the Gmail API to enable an enhanced set of features that let you work with ease.
Your data and credentials are stored only on your device, and the app only makes direct connections to Gmail. There are no intermediary servers, and Mimestream does not collect or sell your e-mail.