Proton Mail (unofficial)

io.github.sethbang/proton-mail-mcp · v1.0.2

Unofficial Proton Mail MCP — send, read, search & organize email over SMTP and IMAP

Website Source code Set it up

Connect Runs on your machine

Terminal

claude mcp add proton-mail-mcp -e PROTONMAIL_USERNAME=<PROTONMAIL_USERNAME> -e PROTONMAIL_PASSWORD=<PROTONMAIL_PASSWORD> -e PROTONMAIL_HOST=<PROTONMAIL_HOST> -e PROTONMAIL_PORT=<PROTONMAIL_PORT> -e PROTONMAIL_SECURE=<PROTONMAIL_SECURE> -e IMAP_HOST=<IMAP_HOST> -e IMAP_PORT=<IMAP_PORT> -e IMAP_SECURE=<IMAP_SECURE> -e IMAP_USERNAME=<IMAP_USERNAME> -e IMAP_PASSWORD=<IMAP_PASSWORD> -e READONLY=<READONLY> -e RESTRICT_OUTBOUND_TO_SELF=<RESTRICT_OUTBOUND_TO_SELF> -e ALLOW_FILE_DOWNLOAD_DIR=<ALLOW_FILE_DOWNLOAD_DIR> -e ALLOW_EMPTY_FOLDER=<ALLOW_EMPTY_FOLDER> -e DEBUG=<DEBUG> -- npx -y [email protected]

claude_desktop_config.json

{
  "mcpServers": {
    "proton-mail-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "[email protected]"
      ],
      "env": {
        "PROTONMAIL_USERNAME": "<PROTONMAIL_USERNAME>",
        "PROTONMAIL_PASSWORD": "<PROTONMAIL_PASSWORD>",
        "PROTONMAIL_HOST": "<PROTONMAIL_HOST>",
        "PROTONMAIL_PORT": "<PROTONMAIL_PORT>",
        "PROTONMAIL_SECURE": "<PROTONMAIL_SECURE>",
        "IMAP_HOST": "<IMAP_HOST>",
        "IMAP_PORT": "<IMAP_PORT>",
        "IMAP_SECURE": "<IMAP_SECURE>",
        "IMAP_USERNAME": "<IMAP_USERNAME>",
        "IMAP_PASSWORD": "<IMAP_PASSWORD>",
        "READONLY": "<READONLY>",
        "RESTRICT_OUTBOUND_TO_SELF": "<RESTRICT_OUTBOUND_TO_SELF>",
        "ALLOW_FILE_DOWNLOAD_DIR": "<ALLOW_FILE_DOWNLOAD_DIR>",
        "ALLOW_EMPTY_FOLDER": "<ALLOW_EMPTY_FOLDER>",
        "DEBUG": "<DEBUG>"
      }
    }
  }
}

~/.cursor/mcp.json

{
  "mcpServers": {
    "proton-mail-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "[email protected]"
      ],
      "env": {
        "PROTONMAIL_USERNAME": "<PROTONMAIL_USERNAME>",
        "PROTONMAIL_PASSWORD": "<PROTONMAIL_PASSWORD>",
        "PROTONMAIL_HOST": "<PROTONMAIL_HOST>",
        "PROTONMAIL_PORT": "<PROTONMAIL_PORT>",
        "PROTONMAIL_SECURE": "<PROTONMAIL_SECURE>",
        "IMAP_HOST": "<IMAP_HOST>",
        "IMAP_PORT": "<IMAP_PORT>",
        "IMAP_SECURE": "<IMAP_SECURE>",
        "IMAP_USERNAME": "<IMAP_USERNAME>",
        "IMAP_PASSWORD": "<IMAP_PASSWORD>",
        "READONLY": "<READONLY>",
        "RESTRICT_OUTBOUND_TO_SELF": "<RESTRICT_OUTBOUND_TO_SELF>",
        "ALLOW_FILE_DOWNLOAD_DIR": "<ALLOW_FILE_DOWNLOAD_DIR>",
        "ALLOW_EMPTY_FOLDER": "<ALLOW_EMPTY_FOLDER>",
        "DEBUG": "<DEBUG>"
      }
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "proton-mail-mcp": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "[email protected]"
      ],
      "env": {
        "PROTONMAIL_USERNAME": "<PROTONMAIL_USERNAME>",
        "PROTONMAIL_PASSWORD": "<PROTONMAIL_PASSWORD>",
        "PROTONMAIL_HOST": "<PROTONMAIL_HOST>",
        "PROTONMAIL_PORT": "<PROTONMAIL_PORT>",
        "PROTONMAIL_SECURE": "<PROTONMAIL_SECURE>",
        "IMAP_HOST": "<IMAP_HOST>",
        "IMAP_PORT": "<IMAP_PORT>",
        "IMAP_SECURE": "<IMAP_SECURE>",
        "IMAP_USERNAME": "<IMAP_USERNAME>",
        "IMAP_PASSWORD": "<IMAP_PASSWORD>",
        "READONLY": "<READONLY>",
        "RESTRICT_OUTBOUND_TO_SELF": "<RESTRICT_OUTBOUND_TO_SELF>",
        "ALLOW_FILE_DOWNLOAD_DIR": "<ALLOW_FILE_DOWNLOAD_DIR>",
        "ALLOW_EMPTY_FOLDER": "<ALLOW_EMPTY_FOLDER>",
        "DEBUG": "<DEBUG>"
      }
    }
  }
}

Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.

Tools

This server runs locally, so its tools are listed by your MCP client once it starts.

Environment variables

Name	Description
`PROTONMAIL_USERNAME` Required	Your Proton Mail email address
`PROTONMAIL_PASSWORD` Required, secret	Your Proton Mail SMTP password (not your login password; generate one in Proton settings)
`PROTONMAIL_HOST` Optional	SMTP host
`PROTONMAIL_PORT` Optional	SMTP port
`PROTONMAIL_SECURE` Optional	Use TLS for SMTP (true for port 465)
`IMAP_HOST` Optional	Proton Mail Bridge IMAP host (required for read/search tools)
`IMAP_PORT` Optional	Proton Mail Bridge IMAP port
`IMAP_SECURE` Optional	Use TLS for IMAP
`IMAP_USERNAME` Optional	Proton Mail Bridge username (falls back to PROTONMAIL_USERNAME)
`IMAP_PASSWORD` Optional, secret	Proton Mail Bridge password (falls back to PROTONMAIL_PASSWORD)
`READONLY` Optional	Disable all mutating tools (send, move, delete, flags, labels, bulk ops, folder/label management)
`RESTRICT_OUTBOUND_TO_SELF` Optional	Refuse live sends to any recipient other than PROTONMAIL_USERNAME (for throwaway/QA accounts)
`ALLOW_FILE_DOWNLOAD_DIR` Optional	Allowlist directory enabling download_attachment.saveTo; when unset, attachments return as inline base64
`ALLOW_EMPTY_FOLDER` Optional	Register the empty_folder tool (not recommended)
`DEBUG` Optional	Enable verbose logging to stderr

Details

Package	`[email protected]` (NPM, stdio)
First published	30 May 2026
Last updated	30 May 2026
Registry name	`io.github.sethbang/proton-mail-mcp`

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Local install

Installed and run on your own machine, so there is no public endpoint to check.

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