Domain Email Security Check
Enter a domain to check DNS-based email authentication and common deliverability risks.
Enter a domain to begin.
Email Header Analyzer
Paste full email headers to verify real-world SPF, DKIM, DMARC, alignment, and spam filtering signals.
How to get email headers
Gmail:
Open the message → click the three dots → Show original → Copy to clipboard.
Outlook / Microsoft 365:
Open the message → File / Message options → Internet headers → copy all headers.
Apple Mail:
View → Message → All Headers.
Gmail:
Open the message → click the three dots → Show original → Copy to clipboard.
Outlook / Microsoft 365:
Open the message → File / Message options → Internet headers → copy all headers.
Apple Mail:
View → Message → All Headers.
Paste a message header to diagnose real-world delivery problems.