Email Security Check: free verification of MX, blacklists and SPF/DMARC
Email Security Check is a free tool that assesses a domain's email security posture: it resolves the MX records, checks the mail servers' IP addresses against the major DNSBL blacklists and summarizes the SPF and DMARC configuration. It returns an overall score and the issues to fix.
What the email security check is for
If a domain's mail server ends up on a blacklist, or if SPF and DMARC are not configured, emails risk being rejected or marked as spam. Regularly checking reputation and configuration is essential for deliverability, especially for those sending newsletters, transactional email or business communications.
How Email Security Check works
Enter a domain and the tool resolves the MX records, derives the mail servers' IPs and queries them against known DNSBL blacklists (Spamhaus, SpamCop, Barracuda), reusing the SPF/DMARC analysis of the DNS module. When a blacklist cannot be queried it says so openly, with no false reassurance.
100% free tool: 3 checks per day with no sign-up, 50 per session with a free account.