Email header analyzer

Leave empty

Lookup

IP / Domain / ASN HTTP headers check HTTP header score Domain WHOIS / RDAP IP WHOIS / RDAP Reverse DNS / PTR RBL check Bulk RBL check SSL certificate DNS lookup DNSSEC validator SPF / DKIM / DMARC MX / mail diagnostics

Tools

Ping Traceroute MTR TCP ping (tcping) Subnet calc IPv4/IPv6 Header generator cURL generator Email header analyzer SPF / DMARC generator IPv6 test Port scanner Bandwidth convert

Learn

Cheatsheets Wireshark filters

Others

Multi-RBL check MXToolBox ViewDNS.info Robtex MAC Vendors Site24x7 IPv4 Subnet Calculator CertLogik Certificate Decoder Downdetector CZ World Time Buddy ThousandEyes Outages Radware Live Threat Map Mailservis Domain Checker

Email header analyzer

Paste message headers only; analysis runs locally.

Leave empty

Email header analyzer. Parses raw RFC 5322 message headers to reconstruct delivery hops, inspect timestamps, summarize SPF/DKIM/DMARC results and compare From with Return-Path domains. It processes only the text you paste into the form.