Email Header Analyzer
Paste raw email headers to inspect routing, authentication and message metadata directly in your browser.
How to Use the Email Header Analyzer
Paste raw email headers to inspect routing, authentication and message metadata in a more readable format.
Practical Example
A received message may contain multiple Received lines showing the servers it passed through, plus SPF or DKIM authentication results.
Factors That Affect the Result
Mail-provider formatting, missing headers, forwarded messages, authentication systems and privacy redaction affect the available information.
Frequently Asked Questions
What are email headers?
They are metadata fields describing message routing, addressing and other delivery information.
Can headers help investigate delivery issues?
Yes, routing and authentication fields can provide useful troubleshooting clues.
Should private headers be shared publicly?
No. Headers can contain addresses, server names and other sensitive metadata.
What Email Headers Can Reveal
Email headers contain routing and technical metadata added as a message travels between mail systems. Fields can include sender and recipient information, Message-ID, timestamps, authentication results, and a chain of Received headers showing mail-server hops.
Reading Authentication Signals
SPF, DKIM, and DMARC results can help evaluate whether a message passed domain authentication checks, but no single header field proves that a message is safe. Display names and visible From addresses can be misleading, and legitimate forwarding can complicate authentication results.
Use header analysis to investigate delivery paths, delays, spoofing indicators, or configuration problems. Treat message content, links, attachments, sender context, and organizational security controls as part of the assessment. Headers can contain email addresses, IP addresses, server names, and other potentially sensitive metadata, so avoid sharing complete headers publicly unless private information has been reviewed and removed.