MAILTYPE — Email Domain Capability Intelligence for ChatGPT

io.github.gsterlingpress/mailtype

Email-domain intelligence: MX capability, provider, disposable status, SPF, DMARC, and MTA-STS.

client:ChatGPT transport:streamable-http

Install MAILTYPE — Email Domain Capability Intelligence in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://mailtype-api.onrender.com/mcp

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