NextdoorSEC · email security
A free 60-second scan of your SPF, DKIM, DMARC, MTA-STS and TLS records — run by a registered cybersecurity firm, not a lead-capture form. See exactly what spoofers and spam filters see.
No signup. No email required. We only read public DNS records.
“We're a real Belgian cybersecurity firm — we break into companies for a living, so we know exactly how domain spoofing turns into fraud. We don't outsource, and we protect our own domain to the same standard we'll protect yours.”
Aydan Arabadzha · Chief Hacking Officer, NextdoorSEC BV · Antwerp, Belgium
See the firm at nextdoorsec.com ↗Scan free
See your grade and exactly what's exposed — no signup, public DNS only.
We fix it in 14 days
We configure SPF, DKIM, DMARC & MTA-STS and move you to enforcement (p=reject) — without breaking a single real email. You approve one DNS change; we do the rest.
Stay protected
Optional monitoring keeps you enforced as your email tools change, and alerts you the moment someone tries to impersonate you.
Free Scan
€0
Your A–F grade and every issue, instantly. No signup. Use it as often as you like.
14-Day Sprint
€290 one-time
The done-for-you fix. We take you to an enforced, A-rated setup in 14 days and prove it with a live spoof-test and a signed certificate. Includes your first month of monitoring. Money-back guarantee.
Monitoring
€149/mo
Protection doesn't hold itself. Every month we:
Cancel anytime. 2 months free on annual.
Managing 5+ domains or an agency? Managed & white-label from €490/mo →
🏛️ A real, registered security firm. NextdoorSEC BV, Antwerp, VAT BE0798791337 — not an anonymous SaaS.
🔒 We never touch your mailbox. We only work with public DNS records you publish, and you approve every change.
✅ You're guaranteed. A-rated and enforced in 14 days or your money back, verified by a scan you run yourself.
No. We move to enforcement in stages and verify your legitimate senders are aligned before anything tightens — so real mail keeps flowing. Zero downtime, and you approve every DNS change before it goes live. This careful, staged rollout is exactly why most businesses get stuck at monitor-only and never reach real protection.
Setting DMARC once isn't enough — every time you add a newsletter tool, CRM, or invoicing app, it can send as your domain and silently break authentication. Monitoring watches for that, reads the DMARC reports that show who's sending as you (including impersonators), keeps you enforced, and sends a signed monthly report. It's the difference between fixing it once and staying safe.
You can — the records are public. But DMARC done wrong blocks your own invoices, and clients never getting them is worse than the risk you started with. That fear is why most SMBs leave DMARC at p=none, which protects nothing. We do it safely, fast, and keep it working.
Never. We only read and help you publish public DNS records. We do not read, send, or store your email.
The Un-Spoofable Guarantee: if your domain isn't A-rated and enforced (p=reject) within 14 days of your DNS step — verified by a re-scan you run yourself — you pay nothing.