New Free Tools Released: Message Header Analyzer & Entra ID Tenant Domain Lookup

Message Header Analyzer

Try it out at: https://mha.syonsecurity.com

Parses email headers and shows:

• Full delivery path
• SPF, DKIM, DMARC results
• TLS usage
• Sender/receiver details
• Hop timeline

Great for phishing analysis and mail flow debugging. The message submitted does not leave your device, it is all processed locally on the browser.

Entra ID Tenant Domain Lookup

Try it out at: https://recon.syonsecurity.com

Enter any domain to list all verified/associated domains in the same Microsoft 365 / Entra ID tenant.

Useful for reconnaissance and tenant mapping. Previously the technique was modified by Microsoft in 2025. This tool utilizes the newly discussed method implemented in a easy form factor for the user.