proton-mail-bridge-client

MCP server · npm · ★ 84 · graded 2026-10-24Source linked

Local-first Proton Mail MCP server and CLI via Proton Bridge. Search, draft, send and organize mail from Claude Desktop, Claude Code or any MCP client. 96 tools, read-only and send-to-self modes.

No outside reports on file

proton-mail-bridge-client is distributed via npm (proton-mail-bridge-client); review its source code, dependencies, and requested permissions before use.

Based on public adoption and transparency signals as of Oct 24, 2026. Our opinion, not a code audit or security guarantee.

Was this verdict for Proton Mail Bridge Client helpful?

What it can access

Local filesNo local folder access notedLOW
Command executionRuns shell or system commandsREVIEW
Network reachConnects to outside service APINOTED
CredentialsNo API token requiredLOW
Package sourcenpm (proton-mail-bridge-client)PUBLIC

Inferred from this listing’s public package details and description. Check the project’s source before installing.

Install

npx -y proton-mail-bridge-client

All setup options ↓

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About Proton Mail Bridge Client

Proton Mail Bridge Client is an MCP server focused on Developer tools and Web & browsing: Local-first Proton Mail MCP server and CLI via Proton Bridge. Search, draft, send and organize mail from Claude Desktop, Claude Code or any MCP client. 96 tools, read-only and send-to-self modes.

It is published on npm as proton-mail-bridge-client and hosted on GitHub at googlarz/proton-mail-bridge-client (80 GitHub stars, 1,175 weekly npm downloads). Based on its public metadata, it operates with standard local or API scope without broad shell execution flags noted.

Setup

Check these steps against the project’s own instructions before running anything.

Run proton-mail-bridge-client with --ignore-scripts in claude_desktop_config.json or .cursor/mcp.json:

json

{
  "mcpServers": {
    "proton-mail-bridge-client": {
      "command": "npx",
      "args": ["-y", "--ignore-scripts", "proton-mail-bridge-client"]
    }
  }
}

Why this grade

BB — Some risk signals

Signal-based grade (4/7 points): listed in several sources, public source code. This reflects adoption and transparency, not a code review.

Popularity and upkeep

47/100

GitHub stars: 84
Weekly npm downloads: 1.2k
Listing last refreshed: 2026-10-29

These are public popularity signals, not a maintenance check. Look at the repository’s commit history and open issues.

Security reports

No reports found for this package in our research (last checked 2026-10-30).

Check a specific version →

Risks to watch for

Dependency & version pinning: Distributed via npm (proton-mail-bridge-client). Pin an exact release version or commit SHA rather than floating tags so upstream updates are reviewed first.

How to lower the risk

Least-privilege permissions

Give it access only to the specific folders, accounts or projects it needs, never your whole drive or admin account.
Use a separate, limited API key or login just for this tool so you can switch it off without affecting anything else.

Network isolation

Run it on a work computer or sandbox account, not one holding personal or company-sensitive data.
If your IT team can, limit which websites and services it is allowed to contact.

Monitoring

Check its activity history or logs weekly at first, and look at what it changed or sent.
Turn on alerts for new logins or unusual usage on any account it connects to.

Red flags to watch for

It asks for more access than its job requires, or prompts you to paste passwords.
It suddenly updates with new owners, or starts contacting unfamiliar websites.

Questions

How do I install Proton Mail Bridge Client?

Run npx -y proton-mail-bridge-client in your terminal, or add the server entry to your claude_desktop_config.json or .cursor/mcp.json as shown in the Setup section on this page. Full setup docs and environment variables are in github.com/googlarz/proton-mail-bridge-client.

Are there security reports about Proton Mail Bridge Client?

No reports found for this package in our research (last checked 2026-10-30). Proton Mail Bridge Client currently holds Grade B (Some risk signals) based on public adoption and transparency signals. Key risk areas to watch include dependency & version pinning:.

Is Proton Mail Bridge Client actively maintained?

Proton Mail Bridge Client has 84 GitHub stars and 1.2k weekly npm downloads. Our directory data was last refreshed on 2026-10-29. Check recent commit activity, release tags, and open issues at github.com/googlarz/proton-mail-bridge-client before pinning it in production.

What are alternatives to Proton Mail Bridge Client?

You can compare Proton Mail Bridge Client side by side with other Search MCP servers in the Related tools section on this page, or use the Compare tool on AgentArmorHQ.

Maintain or use Proton Mail Bridge Client? Show its live grade in your GitHub README, docs site, or run a check from the terminal before you install.

AgentArmorHQ Risk Grade B for Proton Mail Bridge Client

GitHub README Markdown:

markdown

[![AgentArmorHQ Risk Grade for Proton Mail Bridge Client](https://agentarmorhq.com/api/badge/googlarz-proton-mail-bridge-client)](https://agentarmorhq.com/skills/googlarz-proton-mail-bridge-client)

HTML embed:

html

<a href="https://agentarmorhq.com/skills/googlarz-proton-mail-bridge-client"><img src="https://agentarmorhq.com/api/badge/googlarz-proton-mail-bridge-client" alt="AgentArmorHQ Risk Grade for Proton Mail Bridge Client" height="20" /></a>

Terminal check:

terminal

curl -fsSL https://agentarmorhq.com/api/cli | node --input-type=module - check "googlarz-proton-mail-bridge-client"

Share with your security lead

Need sign-off to use proton-mail-bridge-client? Copy this note for Slack, a ticket or a pull request.

### AgentArmorHQ Security Review Memo: proton-mail-bridge-client
- **Listing URL:** https://agentarmorhq.com/skills/googlarz-proton-mail-bridge-client
- **Type:** App connector
- **Risk Grade:** Grade B (Some risk signals)
- **Outside Security Advisories on File:** 0
- **Public Adoption:** 84 GitHub stars, 1.2k weekly npm downloads

#### Permission & Blast-Radius Signals
- **Local files:** No local folder access noted
- **Command execution:** Runs shell or system commands
- **Network reach:** Connects to outside service API
- **Credentials:** No API token required
- **Package source:** npm (proton-mail-bridge-client)

#### Recommended Hardened Setup
- **Command:** `npx -y --ignore-scripts proton-mail-bridge-client`
- **Controls:** Pin an exact version in `.mcp.json`, scope access to a single workspace folder, and use a least-privilege read-only token where supported.

_Based on public adoption and transparency signals as of Oct 24, 2026. Our opinion, not a code audit or security guarantee._

Key facts

Type: App connector
Publisher: googlarz
Source code: github.com/googlarz/proton-mail-bridge-client
Install command: npm install proton-mail-bridge-client
Est. context load: ~1.1k tokens / turn (~6 tool schemas, 0.53% of 200k context)
Popularity: 84 GitHub stars, 1.2k weekly npm downloads
Last updated: 2026-10-29
Last graded: 2026-10-24

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