https://edgedns.dev/tools
Free DNS, DMARC & SPF tools | EdgeDNS
Free browser-based DNS propagation, DMARC, and SPF lookup tools — no signup. Or talk to them from Claude, ChatGPT, or Gemini via MCP.
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https://www.valimail.com/blog/spf-alignment-failures/
SPF alignment failures: causes, fixes & monitoring tools - Valimail
Apr 20, 2026 - SPF alignment failures break DMARC and hurt deliverability. Learn what causes them, how to diagnose issues, and monitoring tools to prevent them.
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https://nic.ua/en/domains/tools
Domain & IP Check Tools Online — RDAP, DNS Records, MX/SPF/DKIM, DNSBL, IP Geolocation
Online tools for domains and IPs: RDAP (WHOIS alternative), DNS record lookup, MX/SPF/DKIM checks, DNSBL spam-list check, and IP geolocation by country and...
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