dnsai.com
Free DNS, WHOIS, DKIM discovery, SPF/DMARC analysis and blacklist checks with plain-English results, no signup.
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mxtoolbox.com
MXToolbox tool for analyzing email headers, tracing message routes, and spotting delivery or authentication issues.
intodns.ai
AI-powered DNS and email security scanner with SPF, DKIM, DMARC, DNSSEC checks and fix suggestions.