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protonmail-mcp

This MCP server provides email sending functionality using Protonmail's SMTP service. It allows both Claude Desktop and Cline VSCode extension to send emails on your behalf using your Protonmail credentials.

→ amotivv/protonmail-mcp· listed on github_topic
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// key findings
⚠️
Known vulnerabilities in dependencies: 3 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.
✅
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: PROTONMAIL_PASSWORD
These are read from process.env at runtime. Make sure you trust where they’ll be sent.
// known CVEs in dependencies3 high1 medium2 low

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

high@modelcontextprotocol/sdk@0.6.0GHSA-8r9q-7v3j-jr4g

Anthropic's MCP TypeScript SDK has a ReDoS vulnerability

high@modelcontextprotocol/sdk@0.6.0GHSA-w48q-cv73-mx4w

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

highnodemailer@6.10.0GHSA-rcmh-qjqh-p98v

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

mediumnodemailer@6.10.0GHSA-mm7p-fcc7-pg87

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

lownodemailer@6.10.0GHSA-c7w3-x93f-qmm8

Nodemailer has SMTP command injection due to unsanitized `envelope.size` parameter

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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.
configPROTONMAIL_HOST— SMTP server hostname (default: smtp.protonmail.ch)
🔐 secretPROTONMAIL_PASSWORD— Your Protonmail SMTP password (not your regular login password)
configPROTONMAIL_PORT— SMTP server port (default: 587 for STARTTLS, 465 for SSL/TLS)
configPROTONMAIL_SECURE— Whether to use a secure connection (default: "false" for port 587, "true" for port 465)
configPROTONMAIL_USERNAME— Your Protonmail email address
// 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 4 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/amotivv-protonmail-mcp-3xomo5)](https://m8ven.ai/mcp/amotivv-protonmail-mcp-3xomo5)
commit: fdca87e7a0615c21a2b7a4b411e39c93399ab7ec
code hash: 197d84235181b1539aa249d8129624927eae5cd3971851452b3956eb33c6bc23
verified: 6/14/2026, 10:51:07 AM
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