Email Header Analyzer
Paste raw email headers and see the delivery path decoded — every hop with timestamps, delays, and SPF/DKIM/DMARC authentication results. Find out where an email was delayed or why it failed authentication.
Hop-by-hop pathDelay detectionSPF / DKIM / DMARCSlowest hop identification
How to get email headers
Gmail
Open the email → Click the ⋮ menu (top right) → Click 'Show original' → Copy the headers from the top of the page.
Outlook (Web)
Open the email → Click ⋯ menu → View → View message source. Copy everything before the email body.
Apple Mail
Open the email → View menu → Message → All Headers. Or View → Message → Raw Source.
Common questions
What do email headers tell you?
Headers show the full delivery path — every server the email passed through, with timestamps. They also contain authentication results (SPF, DKIM, DMARC) and can reveal if an email was delayed, spoofed, or altered in transit.
Why is my email delayed?
Look for the hop with the highest delay time. Common causes: overloaded mail servers, spam filters scanning the message, graylisting (intentional delay for first-time senders), or DNS resolution issues.
What does SPF/DKIM/DMARC pass/fail mean in headers?
Pass means the email passed that authentication check — it's legitimate. Fail means the sending server wasn't authorized (SPF), the signature didn't match (DKIM), or the domain policy wasn't met (DMARC). Failures increase the chance of spam filtering.