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We rebuilt our free Email Security Checker after finding it reported "Pass" on configurations that were partially broken. Here are five real RFC edge cases in SPF, DMARC, and DKIM — illustrated with real, public domains — that a shallow checker will never catch.
Generate correct SPF and DMARC DNS records in seconds, and check whether any password has appeared in a data breach — without ever sending the password to a server.
Free DNS checker, SSL certificate inspector, email security validator (SPF, DMARC, DKIM), and HTTP headers analyzer. No account, no install, instant results from your browser.
Google and Yahoo now require DMARC, SPF, and DKIM for all senders. If your domain is not configured correctly, your email lands in spam or gets rejected outright.
