Where Does Mimestream Store Data on Mac?
Mimestream sandboxed container on Mac, and why its local mail is cache you can safely reset.
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Mimestream installs from its own DMG (never the App Store) into /Applications/Mimestream.app, and keeps accounts, Core Data cache, offline mail and attachments in a sandboxed Containers folder under ~/Library (remove any Mimestream named folder there on uninstall).
It speaks Gmail API rather than IMAP, so true mail lives on Google servers and the container is disposable cache. Attachment trouble or bloat ends at the in app Safe Mode cache reset, which refetches from the server. Exact bundle folder names may vary by version; match on Mimestream in the name.
Where Mimestream stores this, by platform
~/Library/Containers/*Mimestream*/
Sandboxed data: accounts, Core Data and offline mail cache, attachments. Official uninstall removes Mimestream named folders here. App at /Applications/Mimestream.app. Mac only (macOS 12+); exact container name may vary.
Frequently asked questions
How do I fully uninstall Mimestream?
Drag the app to Trash, then delete any Mimestream named folders in ~/Library/Containers. Mail itself stays on Google servers, so nothing of value leaves with the cache.
Mimestream attachments won't open. How do I fix it?
Reset the cache from the in app Safe Mode options. The container refetches attachments from Gmail on demand, which clears corruption without touching settings.
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