Postedly for ChatGPT

com.postedly/send

Prepare physical mail and fax quotes, review before payment, and track orders with OAuth.

client:ChatGPT transport:streamable-http

Install Postedly in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://postedly.com/mcp/send

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