MailFerret for ChatGPT

com.appin60.mailferret/mailferret

Find and verify work emails with live SMTP checks and catch-all detection. Free 10 calls/day.

client:ChatGPT transport:streamable-http tools:3

Install MailFerret in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://mailferret.appin60.com/mcp

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