Proton Mail (unofficial)

io.github.sethbang/proton-mail-mcp

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

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Add this to your MCP client config — claude_desktop_config.json (Claude Desktop) or .cursor/mcp.json (Cursor).Suits: Claude Desktop · Cursor.

{
  "mcpServers": {
    "proton-mail-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "proton-mail-mcp@1.0.2"
      ],
      "env": {
        "PROTONMAIL_USERNAME": "<your PROTONMAIL_USERNAME>",
        "PROTONMAIL_PASSWORD": "<your PROTONMAIL_PASSWORD>",
        "PROTONMAIL_HOST": "smtp.protonmail.ch",
        "PROTONMAIL_PORT": "587",
        "PROTONMAIL_SECURE": "false",
        "IMAP_HOST": "127.0.0.1",
        "IMAP_PORT": "1143",
        "IMAP_SECURE": "false",
        "IMAP_PASSWORD": "<your IMAP_PASSWORD>",
        "READONLY": "false",
        "RESTRICT_OUTBOUND_TO_SELF": "false",
        "ALLOW_EMPTY_FOLDER": "false",
        "DEBUG": "false"
      }
    }
  }
}
Environment variables
  • PROTONMAIL_USERNAMErequiredYour Proton Mail email address
  • PROTONMAIL_PASSWORDrequiredsecretYour Proton Mail SMTP password (not your login password; generate one in Proton settings)
  • PROTONMAIL_HOSTSMTP host
  • PROTONMAIL_PORTSMTP port
  • PROTONMAIL_SECUREUse TLS for SMTP (true for port 465)
  • IMAP_HOSTProton Mail Bridge IMAP host (required for read/search tools)
  • IMAP_PORTProton Mail Bridge IMAP port
  • IMAP_SECUREUse TLS for IMAP
  • IMAP_PASSWORDsecretProton Mail Bridge password (falls back to PROTONMAIL_PASSWORD)
  • READONLYDisable all mutating tools (send, move, delete, flags, labels, bulk ops, folder/label management)
  • RESTRICT_OUTBOUND_TO_SELFRefuse live sends to any recipient other than PROTONMAIL_USERNAME (for throwaway/QA accounts)
  • ALLOW_EMPTY_FOLDERRegister the empty_folder tool (not recommended)
  • DEBUGEnable verbose logging to stderr

A starting point — check the repository for exact arguments and setup. Restart your client after editing the config.

Category
Developer Tools
Version
1.0.2
Registry
active
Published
5/30/2026

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Nice for visibility, but GitHub marks README links nofollow, so it doesn't pass authority. Use the HTML badge on your site as well.