Domain Health for ChatGPT

com.modernmustardseed/domain-health

Domain checks: SPF, DKIM, DMARC, BIMI, MTA-STS, SSL/TLS and HTTP security headers.

client:ChatGPT transport:streamable-http tools:5

Install Domain Health in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://mcp.modernmustardseed.com/domain-health

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