Proton Mail Bridge
Proton Mail Bridge is a macOS desktop app that connects Proton Mail to desktop email clients like Apple Mail, Outlook, and Thunderbird.
What is Proton Mail Bridge?
Proton Mail Bridge is a desktop email companion app for macOS that lets you use a Proton Mail account with traditional email clients such as Apple Mail, Microsoft Outlook, and Mozilla Thunderbird. It works by creating a local IMAP and SMTP connection on your Mac so your email client can send and receive mail through Proton Mail while preserving Proton’s encryption model. This is useful for people who prefer a desktop mail workflow, need offline access in their mail client, or want to keep using familiar mailbox tools and shortcuts. The app runs alongside your email client and handles message encryption and decryption locally on the device. Proton Mail Bridge is intended for Proton Mail users who want a native desktop email setup instead of relying only on the web or mobile apps.
Key features
- Connect Proton Mail to desktop email clients that use IMAP and SMTP
- Use Proton Mail with Apple Mail, Microsoft Outlook, and Mozilla Thunderbird
- Send and receive mail through a local mail bridge on your Mac
- Access downloaded messages offline in your desktop email client
- Manage one or more Proton Mail accounts in the Bridge app
- Keep your existing desktop email workflow while using Proton Mail
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Safety overview
Status: Safe
Proton Mail Bridge is legitimate software for connecting Proton Mail to desktop email clients. It normally runs in the background and handles mail traffic locally on your Mac, which is expected for its purpose. Because your email client may store downloaded messages on the device, protect your Mac account and disk if you keep sensitive mail offline. Keep the app only if you use Proton Mail with a desktop email client.
Recommendation: Keep Proton Mail Bridge if you use Apple Mail, Outlook, or Thunderbird with your Proton Mail account. If you no longer use that setup, you can remove it, but your desktop email client will stop syncing Proton Mail through Bridge.
Common paths
/Applications/Proton Mail Bridge.app
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