MailByGet for ChatGPT

com.mailbyget/mail

Temporary receive-only email inboxes for agents. Create, list and read messages without signup.

client:ChatGPT transport:streamable-http tools:3

Install MailByGet in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://mailbyget.com/mcp

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