Email Header Analysis Guide

Headers reveal auth outcome and sending path.

Steps

1. Open original/raw view
2. Check SPF/DKIM/DMARC fields
3. Analyze via Header Analyzer

FAQ

Forwarding effects?

SPF may fail; rely on DKIM and DMARC alignment.

ARC?

Used to preserve auth across intermediaries.

Validation & Screenshots

Gmail: Show Original

1. Open the test email → three-dot menu → Show original
2. Confirm SPF: PASS, DKIM: PASS, and DMARC: PASS with alignment
3. Review Authentication-Results details

Screenshot placeholder: /assets/guides/common/gmail-show-original.png

Outlook: Message Header Analyzer

1. Open Outlook on the web
2. View message details → Authentication-Results
3. Or paste headers into Header Analyzer

Screenshot placeholder: /assets/guides/common/outlook-header-details.png

Platform Validators

• SPF Checker
• DKIM Checker
• DMARC Analyzer
• Comprehensive Email Test