How these checks work together
MX shows where mail is routed. SPF lists authorized senders. DMARC defines receiver policy. Header analysis helps inspect what happened to one received message.
Email Security
Email Security Tools
Check public mail DNS records and inspect pasted headers locally. These tools can surface SPF, DMARC, MX, and Authentication-Results signals, but they do not prove complete deliverability or message safety.
FAQ
Do these tools send email?
No. They inspect DNS records or parse pasted headers locally.
Can they prove deliverability?
No. Mailbox provider policy, reputation, DKIM selectors, and content can also matter.
Is pasted header text uploaded?
No. The email header analyzer runs in the browser.