About MailPeek
MailPeek is a free collection of email security and privacy tools. Built for IT professionals, security-conscious users, and anyone who's ever wondered “is this email legit?”
Our Tools
📨 Header Analyzer
Paste raw email headers and get a complete breakdown: sender verification, SPF/DKIM/DMARC authentication status, relay path visualization, and an overall risk score. Useful for investigating phishing attempts or diagnosing delivery issues.
🔍 Domain Health Check
Enter any domain to instantly check its email configuration. We verify MX records, SPF policies, DKIM selectors, and DMARC settings. Ideal for domain administrators and email deliverability troubleshooting.
⚠️ Phishing Detector
Suspicious email address or link? Paste it in and we'll run multiple checks: homograph detection, domain age analysis, authentication verification, disposable email detection, and more. Get a clear verdict and actionable recommendations.
⏱️ Temporary Inbox
Generate a disposable email address with a countdown timer. Use it for signups, verifications, or testing. Messages arrive in real-time. When the timer expires, everything is permanently and irrecoverably deleted. No logs, no archives.
Privacy First
No accounts. You never need to sign up or log in.
No tracking. No analytics scripts, no cookies, no fingerprinting.
No data retention. Header analysis happens server-side and is immediately discarded. Temporary inboxes auto-delete on expiry with zero recovery possible.
No ads. MailPeek is a free tool built to be useful, not to monetize your attention.
Technical Details
DNS lookups use Google's DNS-over-HTTPS (DoH) service for reliable, privacy-respecting resolution. IP geolocation for header analysis uses the free ip-api.com service.
The temporary inbox system uses a dedicated SMTP server that only accepts mail for currently-active addresses. Messages are stored in Redis with TTL-based expiry — when the timer ends, the keys are automatically deleted at the infrastructure level.
All tools run entirely on our servers. Nothing is sent to third parties except the DNS and IP lookups mentioned above.
Contact
MailPeek is an independent project. For questions or issues, reach out via the domain contact.