Nextmail for ChatGPT

sh.nextmail/mcp

AI-native email for businesses, developers, and AI agents.

client:ChatGPT transport:streamable-http

Install Nextmail in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://api.nextmail.sh/mcp

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