How to uninstall Proton Mail on Mac
Before removing local Mail data, sign in through a browser or another trusted device and verify the messages and calendar items you need are available there. If you rely on drafts or offline access, check those specifically. Do not treat a local app folder as a verified server backup, and keep Proton Drive files under their separate product flow.
The recorded test used the official Mac package; the Homebrew route below is separate.
Remove the app
Open Proton Mail and choose Proton Mail › Proton Mail Uninstall from the menu bar, as Proton instructs. Let that process finish before moving any remaining app or uninstaller to Trash. A first run can create Proton Mail Uninstaller.app without a bundle ID; do not discard it before using the vendor flow merely because Mole does not list it.
Review local data
The path below is documented in the current Homebrew cask. In Finder, use Go › Go to Folder to inspect it. Do not remove its parent directory or another product’s data.
| Location | Decision |
|---|---|
~/Library/Application Support/Proton Mail |
Local desktop-app support data listed in the cask zap and removed in the recorded first-run test. Verify needed mail state first. |
The tested package uses bundle ID ch.protonmail.desktop. Review only files that actually appear on this Mac. A missing path needs no cleanup.
Check what remains
Run these read-only commands after quitting the app:
pgrep -il 'Proton Mail'
ls -d "$HOME/Library/Application Support/Proton Mail"
No process output means there is no matching process running now; it does not prove every helper is gone. A listed process needs its owner checked. If ls prints the path, that item remains and needs review. “No such file or directory” means this path is absent; a permission error means its state was not established.
If you installed it with Homebrew
The current proton-mail cask has a zap list covering Proton Mail support data, caches, HTTP storage, logs, preferences and window state. A direct brew command with --zap applies the cask list without consulting Mole’s checkboxes. After backing up, use this command without --zap:
brew uninstall --cask proton-mail
Mole checks each zap path against your selections, other installed apps, and protected locations. An unchecked, shared, or unverifiable path suppresses --zap; selected remnants can still use Mole’s own removal flow. This cask was not the recorded installation channel.
What Mole lists
Mole lists Application Support/Proton Mail as an app-name review row, initially unchecked; exact ch.protonmail.desktop cache, HTTP storage and preferences can be selected by default. The uninstaller app with no bundle ID needs the vendor’s own flow and may not appear in Mole. Proton Drive is separate.
What this test covered
The official Proton Mail DMG 1.14.0 was removed on September 21, 2026. Application Support/Proton Mail (2.5 MB) went to Trash; a bundle-ID-less uninstaller app was moved with Finder afterward. The run did not sign in or verify mail, calendar or account state, and did not exercise the vendor uninstaller.