Koskamo

Mailbuttons MCP

A governed email MCP server for AI agents that provides a sandbox inbox for reading and sending emails. It enforces policy screens on inbound messages, capability checks and tier caps on outbound sends, and maintains a tamper-evident audit chain for all tool calls. It supports 12 tools including message listing, sending, draft management, and audit exports.

Package and access

Local package with source-attributed installation metadata. Koskamo does not execute packages during review.

Mailbuttons MCP logo, by MailbuttonsVendor evidenceLocal stdioSource reviewed; not executedOperated by Mailbuttons
You need:MAILBUTTONS_API_KEY set to the token
Vendor documentation

Checks and signals

Each line is separate evidence, not a trust score.

  • Passed Official MCP Registry namespace is tied to mailbuttons.com ·
  • Popularity 1 GitHub star

What you can do with it

  • Read and list messages and threads in a governed sandbox inbox
  • Send or draft emails with policy checks and audit logging
  • Extract one-time codes from incoming emails
  • Export audit tails for compliance and evidence

Source and maintenance

Vendor evidenceRegistry 0.1.4MIT
mcp-registry: com.mailbuttons/mcp-server@0.1.4Source repositoryProject website
Last repository push
Maintenance checked

Packages and installation

Source-provided package data. Koskamo has not executed or live-probed this package.

@mailbuttons/mcp-server 0.1.4

npmnpx
@mailbuttons/mcp-server package definition
{
  "version": "0.1.4",
  "transport": "stdio",
  "identifier": "@mailbuttons/mcp-server",
  "runtimeHint": "npx",
  "registryType": "npm",
  "environmentVariables": [
    {
      "name": "MAILBUTTONS_API_KEY",
      "format": "string",
      "isRequired": true,
      "description": "A scoped Mailbuttons MCP token (mb_sandbox_...). Sandbox-by-default; external send requires human promotion."
    },
    {
      "name": "MAILBUTTONS_API_URL",
      "format": "string",
      "default": "https://mailbuttons.com",
      "description": "Backend base URL. Defaults to https://mailbuttons.com; set for self-hosted or local."
    }
  ]
}

Tools

Reported by the attributed source; not independently observed by Koskamo.

No tool definitions available.

Maintenance history

Public check and source-refresh events. Editorial and ownership records remain private.

  • · repository · passed · metadata changed · updated
  • · backfill · recorded · Pre-expansion baseline; unobserved rich metadata remains unknown

Connect from your client

Each snippet configures the same source-provided package; replace placeholders before use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Cursor

Merge this local stdio configuration, replace every placeholder environment value, and restart Cursor. Koskamo has not executed this package.
Cursor configuration
{
  "mcpServers": {
    "mailbuttons-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@mailbuttons/mcp-server@0.1.4"
      ],
      "env": {
        "MAILBUTTONS_API_KEY": "<YOUR_MAILBUTTONS_API_KEY>",
        "MAILBUTTONS_API_URL": "<YOUR_MAILBUTTONS_API_URL>"
      }
    }
  }
}

Cline

Merge this local stdio configuration, replace every placeholder environment value, and restart Cline. Koskamo has not executed this package.
Cline configuration
{
  "mcpServers": {
    "mailbuttons-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@mailbuttons/mcp-server@0.1.4"
      ],
      "env": {
        "MAILBUTTONS_API_KEY": "<YOUR_MAILBUTTONS_API_KEY>",
        "MAILBUTTONS_API_URL": "<YOUR_MAILBUTTONS_API_URL>"
      }
    }
  }
}

VS Code

Merge this local stdio configuration, replace every placeholder environment value, and restart VS Code. Koskamo has not executed this package.
VS Code configuration
{
  "servers": {
    "mailbuttons-mcp": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@mailbuttons/mcp-server@0.1.4"
      ],
      "env": {
        "MAILBUTTONS_API_KEY": "<YOUR_MAILBUTTONS_API_KEY>",
        "MAILBUTTONS_API_URL": "<YOUR_MAILBUTTONS_API_URL>"
      }
    }
  }
}

Claude Desktop

Merge this local stdio configuration, replace every placeholder environment value, and restart Claude Desktop. Koskamo has not executed this package.
Claude Desktop configuration
{
  "mcpServers": {
    "mailbuttons-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@mailbuttons/mcp-server@0.1.4"
      ],
      "env": {
        "MAILBUTTONS_API_KEY": "<YOUR_MAILBUTTONS_API_KEY>",
        "MAILBUTTONS_API_URL": "<YOUR_MAILBUTTONS_API_URL>"
      }
    }
  }
}

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