Open source · Runs on your computer

Let Claude handle your Proton Mail, safely.

Proton Mail MCP connects Claude to your mailbox through Proton Mail Bridge on your own computer. Ask Claude to find, read, sum up and tidy your mail. It can't send or permanently delete anything, and your password never reaches Claude.

Download for Windows How it works

Free · MIT license · Signed installer · Works with Claude Desktop and Claude Code

The Proton Mail MCP setup wizard: Set up Proton Mail MCP, with three steps: find Proton Mail Bridge, sign in with your Bridge password, add it to Claude.

Your inbox, with Claude's help

Talk to Claude about your mail the way you'd ask an assistant. Claude finds the messages, reads what you point it to, and keeps your folders in order.

Find and read

List folders and messages, search by sender, recipient, subject, text or date, and read a message in full, with its attachments listed.

Sum up

Ask what's new since Monday, what a long thread decided, or which invoices are still open. Claude reads, you decide.

Organise

Mark read or unread, star, move to a folder, add a label, or move to Trash, up to 50 messages at a time.

Stays in your control

No sending, no permanent deletion, and a cap on how much one session can change. Everything Claude does is something you asked for.

Sum up my unread mail from this week Find the booking for my flight to Lisbon Move all newsletters in my inbox to Archive Star the invoices I haven't paid What did the landlord say about the lease?

Tools: list_folders list_messages search_messages read_message mark_read mark_unread flag unflag move_message add_label trash_message. Next: drafts, viewing images and saving attachments0.4

How it works

Proton Mail Bridge, Proton's own app, decrypts your mail on your computer and offers it to mail programs. Proton Mail MCP is such a program, built for Claude, and it lives right next to Bridge.

Local only

Proton Mail MCP talks to Bridge on 127.0.0.1 and nothing else. Its connection to Bridge is TLS, verified against Bridge's own certificate, which setup pins.

Started by Claude

Claude Desktop and Claude Code start it when they need it. There's no service, no account and no server of ours in between.

Honest about Claude

The messages Claude reads become part of your conversation with Claude, and are processed by Anthropic like anything else you share with Claude.

Built to be trusted with your mail

Mail is personal. These limits are part of the program, with tests that fail if any of them is weakened.

Can't send mail

There is no tool that sends. When sending comes, it will only send a draft you've seen, and only after you turn it on.

Nothing is deleted for good

"Delete" means move to Trash, where you can restore it. Permanent deletion isn't in the program at all.

Your password stays put

You type the Bridge password into setup, and it goes to Windows Credential Manager. Claude never sees it, and it's never in a config file.

Reading changes nothing

Reading a message never marks it read. Only "mark read" does that.

Mail is marked as untrusted

Every message is handed to Claude marked as written by its sender, so Claude can tell your requests from text in an email. Whatever a message says, the tools can only do the limited things on this page.

Open and signed

All code is on GitHub under the MIT license, and every finding of its security review is fixed. Windows builds are code-signed, and every release carries build provenance.

Set up in about a minute

No terminal, no config files. The setup wizard finds Bridge, checks it's really Proton's, and adds Proton Mail MCP to Claude.

Install

You need a Proton plan that includes Proton Mail Bridge (Mail Plus, Unlimited or higher), Bridge installed and signed in, and Claude Desktop or Claude Code.

Windows

Installs for you only, no administrator rights
Starts the setup wizard
Updates keep your settings; nothing to set up again

Download the installer Pick …_windows_amd64_setup.exe, or …_arm64_… on Windows on ARM.

winget pending approval

winget install Codeby.ProtonMailMCP

The same installer, through Windows' package manager. Update with winget upgrade.

macOS and Linux

Download the archive for your system from the release
Run proton-mail-mcp setup in a terminal
The setup wizard comes in 0.5

Setup guide

Questions

Is this made by Proton or Anthropic?

No. Proton Mail MCP is an independent open-source project. It uses Proton Mail Bridge, Proton's own app, the way any mail program does, and Claude's standard way of adding tools (MCP).

Does my mail leave my computer?

Bridge decrypts your mail on your computer, and Proton Mail MCP only talks to Bridge, locally. But the messages you ask Claude to read become part of your conversation with Claude, which Anthropic processes. Ask Claude about the mail you're comfortable sharing with Claude.

Why do I need Proton Mail Bridge and a paid plan?

Proton Mail is end-to-end encrypted, so only Bridge, on your computer, can turn it into ordinary mail that programs can read. Bridge is part of Proton's paid plans.

Can Claude send email or delete my mail?

It can't send at all today. Deleting means moving to Trash, which you can undo. Permanent deletion isn't possible. Sending will come later, and it will only send a draft you've seen, after you turn it on.

What if a message tries to trick Claude?

Messages are given to Claude marked as untrusted content written by their sender, and the tools can only do the limited things above, at most 200 changes per session. You see what Claude does in the conversation.

How do I update or uninstall?

Run a newer installer, or winget upgrade: it replaces the program and keeps your settings. Uninstall from Settings → Apps. It removes Proton Mail MCP from Claude, and your settings and saved password only if you tick that box.

Something doesn't work

Run Proton Mail MCP Check from the Start menu: it tests each step and links to the fix. Every error has a section in the troubleshooting guide. Still stuck? Open an issue.