Stamp for ChatGPT

com.clawhard/stamp

Check a domain's SPF, DKIM, DMARC and MX from live DNS, the Gmail/Yahoo rules, and fix records.

client:ChatGPT transport:streamable-http tools:2

Install Stamp in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://stamp.clawhard.com/mcp

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