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Mailbuttons (mbag.ai)

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Governed email for AI agents (Mailbuttons / mbag.ai): sandbox inboxes, policy gate, audit log.

Code source Site web Documentation

Installation

Ajoutez ceci à la configuration MCP de votre client (Claude Desktop : claude_desktop_config.json ; Cursor : .cursor/mcp.json ; VS Code et les autres utilisent la même forme « mcpServers »).

Remote (streamable-http)
Claude Code 
claude mcp add --transport http mailbuttons-mbag-ai 'https://mailbuttons.com/api/v1/mcp/rpc' --header 'Authorization: <Bearer token: a scoped Mailbuttons MCP token, sent as '\''Bearer mb_sandbox_...'\'' (or mb_production_... once promoted). Get one free: sign in with an email code to get an mbk_ API key, then POST https://mailbuttons.com/api/v1/mcp/sandbox-inboxes with it. Guide: https://mailbuttons.com/developers/#mcp>'
Configuration JSON (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "mailbuttons-mbag-ai": {
            "type": "http",
            "url": "https://mailbuttons.com/api/v1/mcp/rpc",
            "headers": {
                "Authorization": "<Bearer token: a scoped Mailbuttons MCP token, sent as 'Bearer mb_sandbox_...' (or mb_production_... once promoted). Get one free: sign in with an email code to get an mbk_ API key, then POST https://mailbuttons.com/api/v1/mcp/sandbox-inboxes with it. Guide: https://mailbuttons.com/developers/#mcp>"
            }
        }
    }
}
NPM package @mailbuttons/mcp-server
Claude Code 
claude mcp add mailbuttons-mbag-ai -e 'MAILBUTTONS_API_KEY=<your mailbuttons_api_key>' -e 'MAILBUTTONS_API_URL=https://mailbuttons.com' -- npx -y @mailbuttons/mcp-server@0.1.1
Configuration JSON (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "mailbuttons-mbag-ai": {
            "command": "npx",
            "args": [
                "-y",
                "@mailbuttons/mcp-server@0.1.1"
            ],
            "env": {
                "MAILBUTTONS_API_KEY": "<your mailbuttons_api_key>",
                "MAILBUTTONS_API_URL": "https://mailbuttons.com"
            }
        }
    }
}

Variables d'environnement

  • MAILBUTTONS_API_KEY obligatoire secret A scoped Mailbuttons MCP token (mb_sandbox_...). Sandbox-by-default; external send requires human promotion.
  • MAILBUTTONS_API_URL Backend base URL. Defaults to https://mailbuttons.com; set for self-hosted or local.

Documentation

Tirée du README du projet sur GitHub, actualisée chaque semaine. Les liens ouvrent GitHub.

Sommaire
  1. Mailbuttons MCP server
  2. Use it
  3. What the server enforces
  4. Install as an agent skill
  5. Docs

Mailbuttons MCP server

Governed email for AI agents, over the Model Context Protocol. Give an agent a scoped mailbox where the server enforces the guardrails, not the prompt: sandbox-by-default inboxes, a policy gate on every send, and a tamper-evident audit log. External sending and scope changes are human-approved, never granted by the agent itself.

Use it

Hosted (recommended) — a streamable-HTTP endpoint served by the platform:

https://mailbuttons.com/api/v1/mcp/rpc
Authorization: Bearer <your Mailbuttons MCP token>   # mb_sandbox_... (or mb_prod_...)

Local (stdio) — run the npm package and let your agent launch it:

{
  "mcpServers": {
    "mailbuttons": {
      "command": "npx",
      "args": ["-y", "@mailbuttons/mcp-server"],
      "env": { "MAILBUTTONS_API_KEY": "mb_sandbox_..." }
    }
  }
}

Get a scoped token from the dashboard or POST /api/v1/mcp/sandbox-inboxes. Sandbox tokens can never send externally until a human promotes them.

What the server enforces

  • Inbound — a per-mailbox sender policy, fail-closed: mail from strangers bounces by default, so nobody can prompt-inject your agent just by emailing it.
  • Outbound — a recipient blocklist the agent can read but not change; a blocked send returns a normal {"status":"blocked"} result, not an error.
  • Caps + audit — per-account send caps and a hash-chained audit log that records refusals too.
  • Escalation — sending externally or widening scope is propose-only; a named human approves. The agent cannot approve its own request.

Install as an agent skill

This repo ships a root SKILL.md, so any skills-aware agent can add it:

npx skills add mailbuttons/mcp-server

Docs

Mailbuttons is a trading name of Code Cutter Limited (UK, no. 08453060). MIT licensed.

Questions fréquentes

Qu'est-ce que Mailbuttons (mbag.ai) ?

Governed email for AI agents (Mailbuttons / mbag.ai): sandbox inboxes, policy gate, audit log.

Comment installer Mailbuttons (mbag.ai) ?

Il fonctionne comme serveur distant. Dans Claude Code : claude mcp add --transport http mailbuttons-mbag-ai 'https://mailbuttons.com/api/v1/mcp/rpc' --header 'Authorization: <Bearer token: a scoped Mailbuttons MCP token, sent as '\''Bearer mb_sandbox_...'\'' (or mb_production_... once promoted). Get one free: sign in with an email code to get an mbk_ API key, then POST https://mailbuttons.com/api/v1/mcp/sandbox-inboxes with it. Guide: https://mailbuttons.com/developers/#mcp>'. Pour les autres clients, collez la configuration JSON de cette page dans leurs réglages MCP.

Faut-il une clé API pour Mailbuttons (mbag.ai) ?

Oui. Il attend MAILBUTTONS_API_KEY, Authorization, à renseigner dans sa configuration.

Mailbuttons (mbag.ai) est-il open source ?

Oui. Son code est sur GitHub sous licence MIT.

Qui maintient Mailbuttons (mbag.ai) ?

Il est publié par mailbuttons. AI.tn le référence sans le maintenir ni le recommander.

Issu du registre MCP officiel. Être listé n'est pas une recommandation : vérifiez le code et les permissions d'un serveur avant de lui donner accès à vos données.