{"slug": "show-hn-i-wrote-an-email-app-that-accepts-only-one-sender-per-inbox", "title": "Show HN: I wrote an email app that accepts only one sender per inbox", "summary": "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.", "body_md": "Infinite inboxes, including prefixes where you don't have to create inboxes before you use them -- they self create when you add a suffix.\n\nThree 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.\n\nBring you own domain. Bring your own AI (MCP server ready). Forwarding.\n\nPlease help me test it.\n\nComments URL: [https://news.ycombinator.com/item?id=50090932](https://news.ycombinator.com/item?id=50090932)\n\nPoints: 69\n\n# Comments: 56", "url": "https://wpnews.pro/news/show-hn-i-wrote-an-email-app-that-accepts-only-one-sender-per-inbox", "canonical_source": "https://clova.email/", "published_at": "2026-10-14 17:00:59+00:00", "updated_at": "2026-10-15 00:27:16.039268+00:00", "lang": "en", "topics": ["ai-agents", "agent-protocols", "ai-tools"], "entities": ["Hacker News"], "also_reported_by": [], "alternates": {"html": "https://wpnews.pro/news/show-hn-i-wrote-an-email-app-that-accepts-only-one-sender-per-inbox", "markdown": "https://wpnews.pro/news/show-hn-i-wrote-an-email-app-that-accepts-only-one-sender-per-inbox.md", "text": "https://wpnews.pro/news/show-hn-i-wrote-an-email-app-that-accepts-only-one-sender-per-inbox.txt", "jsonld": "https://wpnews.pro/news/show-hn-i-wrote-an-email-app-that-accepts-only-one-sender-per-inbox.jsonld"}}