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What it does

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

Description as published by the publisher in the official MCP Registry, read 10 Oct 2026. Not written or verified by Few Servers.

Facts

Registry name	`com.mailbuttons/mcp-server`
Publisher	mailbuttons.com Namespace verified by the registry through the publisher's domain.
Category	Communication and email sorted by our keyword rules
Transport	remote (streamable-http), local package (npm)
Version	0.1.2
This version published	15 Jul 2026
Last seen	10 Oct 2026, in our crawl of the official MCP Registry
Tested by Few Servers	No

Remote endpoint (streamable-http), as published: https://mailbuttons.com/api/v1/mcp/rpc
npm package, as published: @mailbuttons/mcp-server · version 0.1.0 · transport stdio
```
npx -y @mailbuttons/mcp-server
```
Standard run command for npm packages. The registry publishes the package name, not a command; check the repository for required arguments.

Install details read from the registry record on 12 Oct 2026. We have not run this server.

Needs a key or token: the registry record marks a secret value as required. Declared by the publisher:

Authorization (header, secret, required): Bearer token: a scoped Mailbuttons MCP token, sent as 'Bearer mb_sandbox_...' (or mb_prod_...). Create one in the dashboard, or via POST /api/v1/mcp/sandbox-inb
MAILBUTTONS_API_KEY (environment variable, secret, required): A scoped Mailbuttons MCP token (mb_sandbox_...). Sandbox-by-default; external send requires human promotion.
MAILBUTTONS_API_URL (environment variable, not marked required): Backend base URL. Defaults to https://mailbuttons.com; set for self-hosted or local.

Being listed is not a safety check. Read the repository and check what a server asks for before you connect it. How the directory works.

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