Show HN: I wrote an email app that accepts only one sender per inbox

A developer launched an email app on Hacker News that creates single-sender inboxes, locking each address to the first domain or email account that writes to it and bouncing all other senders. The app offers three inbox types — one-sender, temporary (24 hours, 7 days, etc.), and prefix-based inboxes that self-create when a suffix is added, such as "service-netflix" — and supports bring-your-own domain, forwarding, and a bring-your-own-AI MCP server. The Show HN post drew 69 points and 56 comments, with the developer asking users to help test it.

Infinite inboxes, including prefixes where you don't have to create inboxes before you use them -- they self create when you add a suffix. Three types of inboxes: - One sender. Locks to the first domain to send email except gmail, outlook, etc where it locks to an email account for obivous reasons. It bounces everyone else. - Temporary. Lasts for a while 24h, 7days, etc then bounces. Received messages stay or go as per your choice. - Prefix. The most powerful. Declare a prefix like "service" and then invent any suffix, like "service-netflix" or "service$bank" and it creates a new one-sender inbox locked to whoever wrote first. Bring you own domain. Bring your own AI MCP server ready . Forwarding. Please help me test it. Comments URL: https://news.ycombinator.com/item?id=50090932 https://news.ycombinator.com/item?id=50090932 Points: 69 Comments: 56