Burned Inbox

Email deliverability & inbox placement tester for marketers.

Live: https://burnedinbox.com
Partner: https://warminboxes.com

Pages

• / — Landing page (red/white, editorial bold)
• /test — Live inbox placement tester (3-stage flow)

API Routes

• POST /api/start-test — Takes {domain, email}, returns seed address + DNS analysis
• GET /api/check-result?id=&domain=&elapsed= — Polls for email receipt, returns verdict

Stack

Next.js 15 · Tailwind CSS · IBM Plex Mono · Bebas Neue · Vercel

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Deploy to Vercel

# Option A — CLI
npm i -g vercel && vercel --prod

# Option B — GitHub import
# vercel.com/new → import repo → auto-detected as Next.js → Deploy

Domain setup

1. Vercel dashboard → Project → Settings → Domains
2. Add burnedinbox.com (primary)
3. Add burnedinboxes.com (alias — vercel.json handles 301 redirect automatically)

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Wiring Up Real Email Detection

Step 1 — Set up an inbound email handler

Use one of:

• Resend — inbound webhooks (resend.com/docs/receiving-emails)
• Mailgun — inbound routes
• Cloudflare Email Routing → R2 storage → read via Worker

Step 2 — Replace the stub in /api/check-result

The section marked REPLACE IN PRODUCTION is where you poll your inbox. Check the folder header on the received MIME message:

• Gmail: X-GM-THRID + Labels API to check folder
• Generic: parse X-Spam-Status header

Step 3 — Persist sessions

Replace the stateless stub with Redis (Upstash works well on Vercel):

npm install @upstash/redis

Store sessions keyed by id, set TTL of 10 minutes.

Step 4 — Real DNS lookups

Replace lib/dns-checks.ts stub with:

import dns from "dns/promises";
const txt = await dns.resolveTxt(`_dmarc.${domain}`);

Note: Vercel Edge functions don't support Node dns — use a regular serverless function or an external DNS API (Cloudflare DNS over HTTPS works).

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Environment Variables (for production)

RESEND_API_KEY=re_...          # For sending confirmation emails
UPSTASH_REDIS_REST_URL=...     # Session storage
UPSTASH_REDIS_REST_TOKEN=...