MailFixture for ChatGPT

com.mailfixture/mailfixture

Test-inbox API for email and SMS: create inboxes, long-poll messages, extract OTPs and links.

client:ChatGPT transport:streamable-http

Install MailFixture in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://mailfixture.com/mcp

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