MxToolbox Header Analyzer
online
Free
mxtoolbox.com/EmailHeaders.aspx
United States
What it does
Parses email headers to show the complete path an email took, delays between servers, and authentication results (SPF, DKIM, DMARC).
When to use it
- Tracing email origins
- Diagnosing delivery issues
- Verifying email authenticity
When not to use it
- Attachment analysis
- Link scanning
Limitations
- Header analysis only
- No malware scanning