Groundmail for ChatGPT

io.github.groundmail/groundmail

Send transactional email and manage domains, templates, webhooks and suppressions with Groundmail.

client:ChatGPT transport:streamable-http runtime:npm

Install Groundmail in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://mcp.groundmail.dev/mcp

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