What Are Email Headers?
Email headers are hidden metadata that contain crucial information about an email's journey from sender to recipient. Think of them as the "passport stamps" of your email, showing every server it passed through.
Why Analyze Email Headers?
- Verify sender authenticity: Confirm the email actually came from who it claims
- Detect spoofing: Identify forged sender addresses
- Trace email origin: Find the real source of suspicious emails
- Check authentication: Verify SPF, DKIM, and DMARC records
- Investigate spam: Understand why emails end up in spam folders
Key Email Header Fields
1. From & Return-Path
The From field shows the displayed sender, while Return-Path reveals the actual sending address. These should match for legitimate emails.
2. Received Headers
These show the complete routing path. Read from bottom to top to trace the email's journey. Each server adds its own "Received" line.
3. Authentication Results
Modern email systems add authentication results:
- SPF: Verifies the sending server is authorized
- DKIM: Confirms the email hasn't been tampered with
- DMARC: Enforces sender policy and alignment
How to Extract Email Headers
Gmail
- Open the email
- Click the three-dot menu (More)
- Select "Show original"
- Copy the headers or download the .eml file
Outlook
- Open the email
- Click the three-dot menu
- Select "View message source"
- Copy the headers
Using Our Header Analyzer
Our Email Header Analyzer tool makes analysis easy:
- Extract headers using the methods above
- Paste them into our analyzer
- Get instant results on authentication, routing, and security
- Identify potential spoofing or phishing attempts
⚠️ Important:
Email headers can be complex. Our tool automatically parses and explains each component, making it easy for anyone to understand.
Common Red Flags in Headers
- SPF, DKIM, or DMARC failures
- Mismatched From and Return-Path addresses
- Routing through suspicious countries or servers
- Missing or forged Received headers
- Unusual timestamps or timezone inconsistencies
Conclusion
Email header analysis is a powerful tool for verifying email authenticity. While it may seem technical at first, tools like our Header Analyzer make it accessible to everyone. Stay safe by always checking suspicious emails!