Email Header Analyzer Online

The Email Header Analyzer on 101IP parses the technical headers of an email: it shows the delivery route through mail servers, SPF, DKIM and DMARC verification results, and all technical metadata.

How to get email headers

• Gmail: open email → three dots → "Show original" → copy all;
• Outlook: open email → File → Properties → "Internet headers";
• Apple Mail: View → Message → All Headers (Cmd+Shift+H);
• Thunderbird: Ctrl+U or View → Message Source.

What you can learn from headers

• the path of the email from sender to your mailbox — each server leaves its own Received record;
• SPF check result — whether the sender's IP address is authentic;
• presence and status of the DKIM signature — whether the email was altered in transit;
• DMARC policy of the sender's domain;
• the real IP of the sending mail server (useful when suspecting spam).