Email Header Analyzer
Paste original email headers and review From, Return-Path, DKIM signing domain, SPF, DKIM, DMARC, routing, and alignment clues in plain language.
Start Here
Enter the original email headers and run Email Header Analyzer.
Review the Header Analyzer Result
Review the status, warnings, and recommended actions shown in the result panel.
Ready When You Are
Run Email Header Analyzer to see the Header Analyzer result and next actions.
About Email Header Analyzer
Email headers are the delivery receipt inside a message. They show which servers handled the email, which domains were used for SPF, DKIM, and DMARC, and what the receiving inbox decided during authentication. The email header analyzer turns raw header text into readable facts so you do not have to inspect every line manually. Use Email Headers and Message Format to understand the fields in context.
Headers are especially useful when an email lands in spam, fails DMARC, or behaves differently at Gmail, Outlook, or a company inbox. The analyzer can point to authentication results, forwarding behavior, return-path domains, and suspicious hops, but it still needs the full original header text from the received message. If the issue is alignment, read DMARC Alignment after reviewing the parsed results.
What Email Header Analyzer Checks
- From and Return-Path domains
- Authentication-Results for SPF, DKIM, and DMARC
- DKIM signing domain and selector clues
- Basic relaxed alignment review
- Received header count and routing clues
- Plain-English fixes for failed authentication
Questions
Where do I find original email headers?
In Gmail, open the message, use the three-dot menu, and choose Show original. Other inboxes usually call this view original, message source, or internet headers.
Can this read private email safely?
The analyzer runs in your browser. Still, paste only the headers you need and remove message body content if it contains private information.