ProtonMail MCP Server

An MCP server that connects to ProtonMail via Bridge, enabling AI assistants like Claude to manage your email.

→ robotben/protonmail-mcp · 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.

✅

No credential exfiltration, no sensitive file access, no obfuscation

Static analysis found nothing flowing your secrets to unexpected places.

🔐

You'll be asked for 1 credential: PROTONMAIL_PASS

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

// known CVEs in dependencies2 high1 medium6 low

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

highnodemailer@6.9.16GHSA-p6gq-j5cr-w38f

Nodemailer: Message-level raw option bypasses disableFileAccess/disableUrlAccess, enabling arbitrary file read and full-response SSRF in the delivered message

highnodemailer@6.9.16GHSA-rcmh-qjqh-p98v

Nodemailer’s addressparser is vulnerable to DoS caused by recursive calls

mediumnodemailer@6.9.16GHSA-mm7p-fcc7-pg87

Nodemailer: Email to an unintended domain can occur due to Interpretation Conflict

lowmailparser@3.7.1GHSA-7gmj-h9xc-mcxc

mailparser vulnerable to Cross-site Scripting

lownodemailer@6.9.16GHSA-268h-hp4c-crq3

Nodemailer: CRLF injection in Nodemailer List-* header comments allows arbitrary message header injection

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// required environment variables

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

configPORT— The server listens on port 3000 by default. Set the environment variable to change it:

configPROTONMAIL_CONFIG

configPROTONMAIL_IMAP_HOST

configPROTONMAIL_IMAP_PORT

configPROTONMAIL_IMAP_SECURE

🔐 secretPROTONMAIL_PASS

configPROTONMAIL_SMTP_HOST

configPROTONMAIL_SMTP_PORT

configPROTONMAIL_SMTP_SECURE

configPROTONMAIL_USER

// 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/robotben-protonmail-mcp-16flef)](https://m8ven.ai/mcp/robotben-protonmail-mcp-16flef)

commit: dc638cc367323f81d50c07e53db4e4beabf56f33

code hash: 9759c326b7c0a169c2a1db84f24a92d7b6e70f1dd08eaa1b06385f9b12687bb1

verified: 6/22/2026, 1:06:49 PM

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