Mailbuttons (mbag.ai) for ChatGPT

com.mailbuttons/mcp-server

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

client:ChatGPT transport:streamable-http runtime:npm

Install Mailbuttons (mbag.ai) in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://mailbuttons.com/api/v1/mcp/rpc

Custom connectors are a paid-plan feature and take a remote URL only. ChatGPT cannot run a packaged server locally. ChatGPT docs