HostSherlock for ChatGPT

com.hostsherlock/mcp

Check SPF, DKIM, DMARC and MX of any domain, and read the DMARC reports of domains you monitor.

client:ChatGPT transport:streamable-http

Install HostSherlock in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://mcp.hostsherlock.com/v1/mcp

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