Email Header Analyzer
Paste raw email headers to visualize the delivery path, analyze authentication results, and identify delays.
What does the header analyzer do?
Paste the raw headers of an email and the analyzer breaks down the full delivery path (every server hop), the SPF, DKIM and DMARC authentication results, and where time was lost between servers.
When to use it
Use it to debug why a message went to spam, to confirm your authentication is actually passing at the receiver, or to trace unexpected delays in delivery. It reads the same Received and Authentication-Results headers mailbox providers use.
How to get email headers
In Gmail open the message, click the three-dot menu and choose "Show original". In Outlook open the message and use File → Properties. Copy everything and paste it in.
Frequently asked questions
Is the header analyzer free?
Yes, analyzing email headers is free and requires no account.
What can email headers tell me?
They show every server the message passed through, the SPF/DKIM/DMARC results, timestamps and delays, and the originating IP — everything you need to diagnose a deliverability problem.
How do I find the raw headers?
In Gmail use "Show original"; in Outlook use File → Properties; in Apple Mail use View → Message → Raw Source.
Are my pasted headers stored?
Headers are analyzed to produce the result and are not used for anything else.