Is Protonmail Mcp safe to use?

Protonmail Mcp has no known CVEs as of the latest MCPpedia security scan. It does not require authentication, so any local process can connect — keep this in mind in shared environments. Licensed under MIT.

How do I install Protonmail Mcp?

Protonmail Mcp supports copy-paste install configs on its MCPpedia page for Claude Desktop, Cursor, and Claude Code. Scroll to the Quick Install section and select your client.

What can Protonmail Mcp do?

Protonmail Mcp provides 1 tool: send_email. See the full tools list on the server page for descriptions and parameters.

What AI clients work with Protonmail Mcp?

Protonmail Mcp is compatible with claude-desktop, cursor, claude-code. It uses sse and http transport.

Is Protonmail Mcp actively maintained?

Protonmail Mcp is not actively maintained — last commit was 432 days ago. It has 41 GitHub stars.

Protonmail Mcp

Name: Protonmail Mcp
Author: amotivv

npm · by amotivv

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.

41 12.6M/wk 1 tool GitHub npm

No known CVEs

MIT license

Stale

Last commit 432d ago

Works with most clients

Transport: sse, http

1 tool · ~198 tok

Grade A · 0.1% of 200K ctx

Edit this pageView history

Communication Security

Step 1

Install in your client

Config is the same across clients — only the file and path differ.

Supported in Claude Desktopsse, http · Node 18+

Paste into ~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "protonmail-mcp": {
      "args": [
        "-y",
        "npm"
      ],
      "command": "npx"
    }
  }
}

Are you the author?

Add this badge to your README to show your security score and help users find safe servers.

Embed in your READMEAbout badges →

[![MCPpedia Score](https://mcppedia.org/api/badge/protonmail-mcp)](https://mcppedia.org/s/protonmail-mcp)

Read me

What Protonmail Mcp does

Test This Server

Run this in your terminal to verify the server starts. Then let us know if it worked — your result helps other developers.

npx -y 'npm' 2>&1 | head -1 && echo "✓ Server started successfully"

After testing, let us know if it worked:

Loading README…

Scored, not listed

Why this score

Five weighted categories — click any category to see the underlying evidence.

Score breakdown

81/100across 5 weighted dimensions

How we score →

0255075100

−19

Security

Maintenance

Efficiency

Documentation

Compatibility

Categoriesclick a row to see evidence

Security

OSV.dev

8 fixed

CVE-2022-29244low · fixedCVSS 3.1

Packing does not respect root-level ignore files in workspaces

### Impact `npm pack` ignores root-level `.gitignore` & `.npmignore` file exclusion directives when run in a workspace or with a workspace flag (ie. `--workspaces`, `--workspace=<name>`). Anyone who has run `npm pack` or `npm publish` with workspaces, as of [v7.9.0](https://github.com/npm/cli/releases/tag/v7.9.0) & [v7.13.0](https://github.com/npm/cli/releases/tag/v7.13.0) respectively, may be affected and have published files into the npm registry they did not intend to include. ### Patch - Up

Affected: >= 7.9.0Fixed in 8.11.0source →

CVE-2018-7408low · fixedCVSS 3

Incorrect Permission Assignment for Critical Resource in NPM

An issue was discovered in an npm 5.7.0 2018-02-21 pre-release (marked as "next: 5.7.0" and therefore automatically installed by an "npm upgrade -g npm" command, and also announced in the vendor's blog without mention of pre-release status). It might allow local users to bypass intended filesystem access restrictions because ownerships of /etc and /usr directories are being changed unexpectedly, related to a "correctMkdir" issue.

Affected: >= 0Fixed in 5.7.1source →

CVE-2013-4116info · fixed

Local Privilege Escalation in npm

Affected versions of `npm` use predictable temporary file names during archive unpacking. If an attacker can create a symbolic link at the location of one of these temporary file names, the attacker can arbitrarily write to any file that the user which owns the `npm` process has permission to write to, potentially resulting in local privilege escalation. ## Recommendation Update to version 1.3.3 or later.

Affected: >= 0Fixed in 1.3.3source →

CVE-2020-15095low · fixedCVSS 3.1

npm CLI exposing sensitive information through logs

Versions of the npm CLI prior to 6.14.6 are vulnerable to an information exposure vulnerability through log files. The CLI supports URLs like `<protocol>://[<user>[:<password>]@]<hostname>[:<port>][:][/]<path>`. The password value is not redacted and is printed to stdout and also to any generated log files.

Affected: >= 0Fixed in 6.14.6source →

CVE-2019-16777low · fixedCVSS 3.1

npm Vulnerable to Global node_modules Binary Overwrite

Versions of the npm CLI prior to 6.13.4 are vulnerable to a Global node_modules Binary Overwrite. It fails to prevent existing globally-installed binaries to be overwritten by other package installations. For example, if a package was installed globally and created a `serve` binary, any subsequent installs of packages that also create a `serve` binary would overwrite the first binary. This will not overwrite system binaries but only binaries put into the global node_modules directory. This b

Affected: >= 0Fixed in 6.13.4source →

Inventory

Tools (1)

Click any tool to inspect its schema.

~198 tokens total

Help improve this page

This server is missing a description.If you've used it, help the community.

Add information

Community

Reviews

Be the first to review

Have you used this server?

Share your experience — it helps other developers decide.

How easy was setup?Did it work reliably?How was the documentation?

Frequently Asked Questions

Is Protonmail Mcp safe to use?: Protonmail Mcp has no known CVEs as of the latest MCPpedia security scan. It does not require authentication, so any local process can connect — keep this in mind in shared environments. Licensed under MIT.
How do I install Protonmail Mcp?: Protonmail Mcp supports copy-paste install configs on its MCPpedia page for Claude Desktop, Cursor, and Claude Code. Scroll to the Quick Install section and select your client.
What can Protonmail Mcp do?: Protonmail Mcp provides 1 tool: send_email. See the full tools list on the server page for descriptions and parameters.
What AI clients work with Protonmail Mcp?: Protonmail Mcp is compatible with claude-desktop, cursor, claude-code. It uses sse and http transport.
Is Protonmail Mcp actively maintained?: Protonmail Mcp is not actively maintained — last commit was 432 days ago. It has 41 GitHub stars.

Similar servers

Others in communication / security

View all →

Mac_messages_mcp95

An MCP server that securely interfaces with your iMessage database via the Model Context Protocol (MCP), allowing LLMs to query and analyze iMessage conversations. It includes robust phone number validation, attachment processing, contact management, group chat handling, and full support for sending and receiving messages.

279 4

Mcp_agent_mail94

Asynchronous coordination layer for AI coding agents: identities, inboxes, searchable threads, and advisory file leases over FastMCP + Git + SQLite

2.0k 6

Evil Mcp Server93

An evil MCP server used for redteam testing

30 1

Autotask Mcp93

MCP server for Kaseya Autotask PSA — 39 tools for companies, tickets, projects, time entries, and more

36 7

MCP Security Weekly

Get CVE alerts and security updates for Protonmail Mcp and similar servers.

Community

Discussion

Start a conversation

Ask a question, share a tip, or report an issue.

Has anyone used this with Cursor?How do you handle auth?Any alternatives?

Edit this pageView history

Communication Security

Step 1

Install in your client

Config is the same across clients — only the file and path differ.

Supported in Claude Desktopsse, http · Node 18+

Paste into ~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "protonmail-mcp": {
      "args": [
        "-y",
        "npm"
      ],
      "command": "npx"
    }
  }
}

Are you the author?

Add this badge to your README to show your security score and help users find safe servers.

Embed in your READMEAbout badges →

[![MCPpedia Score](https://mcppedia.org/api/badge/protonmail-mcp)](https://mcppedia.org/s/protonmail-mcp)

Read me

What Protonmail Mcp does

Test This Server

Run this in your terminal to verify the server starts. Then let us know if it worked — your result helps other developers.

npx -y 'npm' 2>&1 | head -1 && echo "✓ Server started successfully"

After testing, let us know if it worked:

README

Protonmail MCP Server

This MCP server is provided by amotivv, inc., the creators of Memory Box.

Compatibility

This MCP server is compatible with:

Claude Desktop App: The standalone desktop application for Claude
Cline VSCode Extension: The Claude extension for Visual Studio Code

The same implementation works across both platforms since they both use the Model Context Protocol (MCP) standard.

Features

Send emails to one or multiple recipients
Support for CC and BCC recipients
Support for both plain text and HTML email content
Comprehensive error handling and logging

Configuration

The server requires the following environment variables to be set in the MCP settings files for both Claude Desktop and Cline:

Claude Desktop Configuration

Located at: /Users/your-username/Library/Application Support/Claude/claude_desktop_config.json

Cline VSCode Extension Configuration

Located at: /Users/your-username/Library/Application Support/Code/User/globalStorage/saoudrizwan.claude-dev/settings/cline_mcp_settings.json

Both configuration files require the following environment variables:

PROTONMAIL_USERNAME: Your Protonmail email address
PROTONMAIL_PASSWORD: Your Protonmail SMTP password (not your regular login password)
PROTONMAIL_HOST: SMTP server hostname (default: smtp.protonmail.ch)
PROTONMAIL_PORT: SMTP server port (default: 587 for STARTTLS, 465 for SSL/TLS)
PROTONMAIL_SECURE: Whether to use a secure connection (default: "false" for port 587, "true" for port 465)
DEBUG: Enable debug logging (set to "true" to see detailed logs, "false" to hide them)

For detailed information about Protonmail's SMTP service, including how to get your SMTP password, please refer to the official Protonmail SMTP documentation.

Usage

Once configured, you can use the MCP server to send emails with the following tool:

send_email

Sends an email using your Protonmail SMTP account.

Parameters:

to: Recipient email address(es). Multiple addresses can be separated by commas.
subject: Email subject line
body: Email body content (can be plain text or HTML)
isHtml: (Optional) Whether the body contains HTML content (default: false)
cc: (Optional) CC recipient(s), separated by commas
bcc: (Optional) BCC recipient(s), separated by commas

Example:

<use_mcp_tool>
<server_name>protonmail-mcp</server_name>
<tool_name>send_email</tool_name>
<arguments>
{
  "to": "recipient@example.com",
  "subject": "Test Email from Cline",
  "body": "This is a test email sent via the Protonmail MCP server.",
  "cc": "optional-cc@example.com"
}
</arguments>
</use_mcp_tool>

Troubleshooting

If you encounter issues with the MCP server, check the following:

Ensure your Protonmail SMTP credentials are correct in both configuration files
Verify that the SMTP port is not blocked by your firewall
Check if your Protonmail account has any sending restrictions
Look for error messages in the logs:
- Claude Desktop app logs
- Cline VSCode extension output panel
Restart the Claude Desktop app or reload the VSCode window after configuration changes

Development

To build the project:

cd protonmail-mcp
npm install
npm run build

To modify the server, edit the files in the src directory and rebui

... View full README on GitHub

Loading README…

Scored, not listed

Why this score

Five weighted categories — click any category to see the underlying evidence.

Score breakdown

81/100across 5 weighted dimensions

How we score →

0255075100

−19

Security

Maintenance

Efficiency

Documentation

Compatibility

Categoriesclick a row to see evidence

Security

OSV.dev

8 fixed

CVE-2022-29244low · fixedCVSS 3.1

Packing does not respect root-level ignore files in workspaces

Affected: >= 7.9.0Fixed in 8.11.0source →

CVE-2018-7408low · fixedCVSS 3

Incorrect Permission Assignment for Critical Resource in NPM

Affected: >= 0Fixed in 5.7.1source →

CVE-2013-4116info · fixed

Local Privilege Escalation in npm

Affected: >= 0Fixed in 1.3.3source →

CVE-2020-15095low · fixedCVSS 3.1

npm CLI exposing sensitive information through logs

Affected: >= 0Fixed in 6.14.6source →

CVE-2019-16777low · fixedCVSS 3.1

npm Vulnerable to Global node_modules Binary Overwrite

Affected: >= 0Fixed in 6.13.4source →

Inventory

Tools (1)

Click any tool to inspect its schema.

~198 tokens total

Help improve this page

This server is missing a description.If you've used it, help the community.

Add information

Community

Reviews

Be the first to review

Have you used this server?

Share your experience — it helps other developers decide.

How easy was setup?Did it work reliably?How was the documentation?

Frequently Asked Questions

Is Protonmail Mcp safe to use?: Protonmail Mcp has no known CVEs as of the latest MCPpedia security scan. It does not require authentication, so any local process can connect — keep this in mind in shared environments. Licensed under MIT.
How do I install Protonmail Mcp?: Protonmail Mcp supports copy-paste install configs on its MCPpedia page for Claude Desktop, Cursor, and Claude Code. Scroll to the Quick Install section and select your client.
What can Protonmail Mcp do?: Protonmail Mcp provides 1 tool: send_email. See the full tools list on the server page for descriptions and parameters.
What AI clients work with Protonmail Mcp?: Protonmail Mcp is compatible with claude-desktop, cursor, claude-code. It uses sse and http transport.
Is Protonmail Mcp actively maintained?: Protonmail Mcp is not actively maintained — last commit was 432 days ago. It has 41 GitHub stars.