How do I get email headers?

In Gmail: open message → three dots → Show original. Outlook: File → Properties → Internet headers. Paste the raw block into this tool.

Can this tool read my inbox?

No. You paste headers manually. Nothing is fetched from your mail account.

Your paste may lack Authentication-Results (common in some clients). The full header table still helps trace routing.

Compare From vs Return-Path, review Received order for unexpected countries, and check authentication pass/fail when present.

Analyzing headers you received is normal for security triage. Follow workplace policy and privacy law for third-party mail.

Developer Tools

Analyze email headers to trace routes, inspect authentication results, and investigate suspicious mail.