One tip - on the Google OAuth sign-in page, you can inspect the URL's query component to see the redirectURL parameter, and you'll see where Google will send the token. There's definitely no Mimestream-run service component with access tokens to your account. Tokens are granted to the app running on your Mac, not a service. I hope you enjoy trying out the beta, and I look forward to hearing your feedback! Mimestream is free for a limited time during the public beta, but will eventually be a paid app by the time it gets to the Mac App Store. There are no intermediary servers with access to your account or copies of your messages. The app is a traditional email client that makes direct connections to Gmail and stores your data on your Mac. I'm planning a lot more work in this area, including server-side filter configuration, Google Drive support, G Suite directory autocomplete, and more.

Mimestream differs from other email clients because it uses the Gmail API rather than IMAP, so it supports more Gmail-specific features like categorized inboxes, Gmail's search operators, first-class labels support (apply multiple via ⌘L, set colors, etc), synced aliases, synced signatures, etc. Mimestream's advantages over using the Gmail web interface includes features like multiple accounts, a unified inbox, system notifications, swipe actions, dark mode, (some) offline support, tracker prevention, multiple keyboard shortcut sets, and more. It's designed to be fast, lightweight, and use a minimal amount of disk space.

Mimestream is written in Swift, and uses AppKit+SwiftUI for a clean, stock appearance. Hi HN! In the past, I spent over 7 years working on Apple Mail, and today I am really excited to share a new email client I'm building: Mimestream, a native macOS email client for Gmail.

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