ARC-Relay for ChatGPT

com.arc-relay/mcp

DMARC-safe email forwarding for agents: aliases, DNS health checks, and MCP tools on your domains.

client:ChatGPT transport:streamable-http

Install ARC-Relay in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://arc-relay.com/mcp

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