HQBase for ChatGPT

io.github.hqbase/hqbase

Connect AI agents to your self-hosted HQBase shared email workspace.

client:ChatGPT transport:streamable-http

Install HQBase in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://{installation_domain}/mcp

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