missive for ChatGPT

io.usefulapi/missive

Read email/chat conversations, messages, contacts and teams; draft, send and update threads.

client:ChatGPT transport:streamable-http

Install missive in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://missive.usefulapi.io/mcp

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