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Paste raw email headers to trace the routing path, check authentication results, and identify delivery delays.
Paste email headers and click Analyze to see routing hops, authentication results, and delay analysis.
Email headers are metadata added by each mail server as an email travels from sender to recipient. They contain routing information, timestamps, authentication results, and server details. Headers are essential for diagnosing delivery issues, verifying sender authenticity, and understanding the path an email took to reach your inbox.
In Gmail: open the email → click ⋮ → "Show original." In Outlook: open the email → click ⋮ → "View message source." In Apple Mail: View → Message → All Headers. Most email clients have a similar option to view the raw source of a message.
SPF (Sender Policy Framework) verifies the sending server is authorized to send email for the domain. DKIM (DomainKeys Identified Mail) verifies the message was not altered in transit using a cryptographic signature. DMARC (Domain-based Message Authentication) combines both SPF and DKIM and sets a policy for what happens when authentication fails.
Delays usually happen due to spam filtering, greylisting, server overload, or DNS resolution issues. The header analyzer shows exactly which hop caused the delay by calculating the time difference between consecutive Received headers, so you can pinpoint the bottleneck.
Unboxd reads every email and gives you a daily briefing with only what matters.