Checkmails — Email Verification for ChatGPT

eu.checkmails/checkmails

Verify email deliverability by SMTP. Catch-all/disposable/role detection. EU-hosted, GDPR-ready.

client:ChatGPT transport:streamable-http

Install Checkmails — Email Verification in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://checkmails.eu/api/mcp

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