Email Deliverability Checker for ChatGPT

io.github.kryptoscan/email-deliverability-mcp

Check SPF, DKIM, DMARC, blocklists, reverse DNS and email headers against Gmail/Yahoo sender rules.

client:ChatGPT transport:streamable-http tools:3

Install Email Deliverability Checker in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://api.ownmailserver.com/tools/mcp

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