Proton Mail MCP via Bridge (IMAP/SMTP) · 13 tools · dual transport stdio + HTTP.
To add proton-mail-mcp to Claude, run the install command below or copy the ready-made config for Claude Code, Claude Desktop, Cursor and VS Code further down. Restart your client after adding it and its tools show up in your next conversation. It needs 5 environment variables, listed below.
Install
npx -y @alexendros/proton-mail-mcp@0.1.2Environment variables
PROTON_BRIDGE_HOSTSet in your MCP configPROTON_IMAP_PORTSet in your MCP configPROTON_SMTP_PORTSet in your MCP configPROTON_USERNAMESet in your MCP configPROTON_PASSWORDSet in your MCP configInstall with your client
claude mcp add proton-mail --env PROTON_BRIDGE_HOST=<YOUR_PROTON_BRIDGE_HOST> --env PROTON_IMAP_PORT=<YOUR_PROTON_IMAP_PORT> --env PROTON_SMTP_PORT=<YOUR_PROTON_SMTP_PORT> --env PROTON_USERNAME=<YOUR_PROTON_USERNAME> --env PROTON_PASSWORD=<YOUR_PROTON_PASSWORD> -- npx -y @alexendros/proton-mail-mcp@0.1.2
Run this in a terminal to add the server to Claude Code.
What this does
proton-mail-mcp exposes a set of tools to Claude over the Model Context Protocol. After you add it to claude_desktop_config.json (snippet above) and restart Claude Desktop, those tools become callable inside any conversation.
Requirements
This server needs the following environment variables to be set before it can run:
PROTON_BRIDGE_HOST PROTON_IMAP_PORT PROTON_SMTP_PORT PROTON_USERNAME PROTON_PASSWORD
Set these via the env object in your MCP config (see claude_desktop_config.json snippet above).
Frequently asked questions
How do I install proton-mail-mcp?
Run the Claude Code command in the install section to add proton-mail-mcp to Claude Code, or copy the ready-made config for your client from the install section on this page. Restart your client afterwards and the tools appear in your next conversation.
Which clients work with proton-mail-mcp?
This page carries setup and config for Claude Code, Claude Desktop, Cursor and VS Code. Any other MCP client that accepts a standard server config can connect to proton-mail-mcp as well.
Does proton-mail-mcp need an API key?
Yes. Before it can run, set these environment variables: PROTON_BRIDGE_HOST, PROTON_IMAP_PORT, PROTON_SMTP_PORT, PROTON_USERNAME, PROTON_PASSWORD. They go in the env block of your MCP config.
Imported from the Official MCP Registry. The details above come from the registry entry; the maker can claim this listing to correct them, add docs, and see its traffic.
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