protonmail-mcp-server

A read-only MCP server that connects to Proton Mail via Proton Bridge, enabling AI assistants to search, list, and read emails securely without leaving your machine.

→ de-Blanck/protonmail-mcp-server · listed on glama

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// key findings

⚠️

Known vulnerabilities in dependencies: 2 high

Affects packages this MCP installs at runtime. Upgrade or remove the affected dependency.

✅

4 tools verified — handlers match their declared behaviour

4 read-only tools verified — handlers contain no write/delete/exec

✅

No credential exfiltration, no sensitive file access, no obfuscation

Static analysis found nothing flowing your secrets to unexpected places.

✅

Open source with a license and README

Anyone can audit the code, the license is declared, and the publisher documents what it does.

🔐

You'll be asked for 1 credential: PROTON_BRIDGE_PASSWORD

These are read from process.env at runtime. Make sure you trust where they’ll be sent.

// known CVEs in dependencies2 high1 low

Disclosed vulnerabilities in this server's declared npm dependencies (via OSV). Whether each is reachable depends on the installed versions.

high@modelcontextprotocol/sdk@1.6.1GHSA-8r9q-7v3j-jr4g

Anthropic's MCP TypeScript SDK has a ReDoS vulnerability

high@modelcontextprotocol/sdk@1.6.1GHSA-w48q-cv73-mx4w

Model Context Protocol (MCP) TypeScript SDK does not enable DNS rebinding protection by default

lowmailparser@3.7.1GHSA-7gmj-h9xc-mcxc

mailparser vulnerable to Cross-site Scripting

Depend on this server? Get alerted when its CVEs change.Watch this server free →

// required environment variables

This server reads these from process.env. You'll be asked to provide them before it can run.

configPROTON_BRIDGE_HOST— No 127.0.0.1 Bridge host

🔐 secretPROTON_BRIDGE_PASSWORD— Yes — Bridge-generated IMAP password

configPROTON_BRIDGE_PORT— No 1143 Bridge IMAP port

configPROTON_BRIDGE_USER— Yes — Bridge IMAP username (your email)

// full audit trail

The full breakdown of what we checked, the deductions that landed, the network hosts, the dependency advisories, and concrete fix guidance is available to verified publishers.

// improvement guidance — verified publishers only

We have 3 concrete improvements we can share with the publisher of this MCP. Each comes with specific guidance to raise the trust score.

// embed badge in your README

[![M8ven Score](https://m8ven.ai/badge/mcp/de-blanck-protonmail-mcp-server-1mc4pw)](https://m8ven.ai/mcp/de-blanck-protonmail-mcp-server-1mc4pw)

commit: 64f6b43796127836e0996801bdc1caac22681d56

code hash: 43875b455f35a6727e9510e55b0b26afc8801a20f01990b9d806754f813973a0

verified: 6/15/2026, 1:56:02 PM

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