Free Tool — No Signup Required

Email Header Analyzer

Paste any email header to analyze SPF, DKIM, DMARC authentication, trace hop-by-hop latency, and detect suspicious or blacklisted IPs. 100% client-side.

Email Header Source Paste the full header from your email client
—
Authentication Score
📋 Raw Headers ▼ expand
Want automated monitoring?
mailcheck continuously monitors SPF, DKIM, DMARC, MTA-STS, TLS-RPT & BIMI for your domains — so you never miss a misconfiguration.
⚡ Powered by mailcheck — View Plans