I wrote an email app that accepts only one sender per inbox
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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.
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HN · launched Oct 14, 2026 · 114 upvotes (top 9%)
- Horizontal
- Communication
- Prosumer
- Not AI
- Hobby / open-source project
Similar launches
See all 363 similar launches →Could you build this?
Partial The web app UI, inbox generation logic, and sender locking rules are straightforward, but operating a reliable incoming and outgoing custom mail transfer agent (MTA) with anti-spam and strict deliverability is difficult.
What it would actually take: The backend needs an incoming SMTP server or integration with transactional email gateways (e.g., Haraka, Postfix, or AWS SES receiving) connected to an API service (Node.js/Python) and database. The hard parts are maintaining SMTP deliverability, handling SPF/DKIM/DMARC verification dynamically when locking to senders, avoiding false bounces, and running an MCP server securely. It requires seasoned knowledge of email infrastructure and SMTP protocols beyond standard CRUD vibe-coding.
Discussion
20 comments analyzed.
Competitors mentioned: SimpleLogin, Fastmail, Firefox Relay, Paced Email, Vend Email
Concerns raised: Email validators rejecting plus-suffix addresses, Backscatter spam on custom domains, Unclear problem definition and inbox categorization
Feature requests: Disposable forwarding service for SMS, OpenTofu deployment recipe, Automated email replacement in existing accounts
Competitors
Other products that read as similar to this one : 363 launches clear the similarity bar, closest 8 shown.
Attention rank: #48 of 364 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).
Launched 348 days after the earliest competitor.
- Clova Email: Zero Spam, Quiet by Design · ph · 2026-10-06 · 2 upvotes · similarity 0.70
- InboxFlick · ph · 2026-10-19 · 1 upvotes · similarity 0.55
- Temporary Mail · ph · 2026-09-10 · 1 upvotes · similarity 0.55
- AgentMailr · hn · 2026-03-15 · 7 upvotes · similarity 0.54
- InboxJoy · ph · 2026-09-18 · 7 upvotes · similarity 0.54
- OfficialMail · ph · 2026-09-22 · 3 upvotes · similarity 0.53
- Dayfly Mail · ph · 2026-10-21 · 1 upvotes · similarity 0.52
- Temp Mail - Burner Email Inbox · ph · 2026-09-06 · 1 upvotes · similarity 0.51
Other launches for this product
- No other launches for this product.