Email Header Analyzer
Trace a message's delivery path, per-hop delays and authentication results.
Paste raw email headers
In Gmail use Show original; in Outlook View › Message Options/Source; in Apple Mail View › Message › Raw Source. Paste the header block below — it's parsed locally in your browser, nothing is uploaded.
What the analyzer shows
It reconstructs the message's delivery path from the Received headers (oldest to newest), calculates the delay at each hop so you can see where mail was held up, and surfaces the SPF, DKIM and DMARC results from the Authentication-Results header.
Why it matters
Header analysis is how you diagnose slow delivery, trace where a message really originated, and confirm whether a suspicious email actually passed authentication — useful for spotting spoofing and phishing.
Frequently asked questions
No. Everything is parsed in your browser with JavaScript. The site has no server that receives your data.
Paste the full raw header block (everything before the message body). The more complete it is, the more hops and details the analyzer can show.
Each Received hop is timestamped. The delay is the time between hops; large gaps (highlighted) show where a mail server queued or was slow to relay the message.