Agent Mailbox by Ridian for ChatGPT

com.getridian/agent-mailbox

Email inboxes for AI agents at ridianmail.com: read, draft, send, attachments. EU-hosted.

client:ChatGPT transport:streamable-http

Install Agent Mailbox by Ridian in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://api.getridian.com/mcp/mailbox

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