https://dns-lookup.whoisxmlapi.com/api
DNS Lookup API to check MX, NS, etc. server records | WhoisXML API
Our DNS checker API helps users check MX, NS, and other server records via API calls with outputs in JSON or XML. Get started with 500 free API queries.
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https://toolbox.googleapps.com/apps/checkmx/
Check MX: Check MX and SPF Records.
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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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https://mxscan.me/
Free Email Security Scanner - Check SPF, DMARC, DKIM & MX Records | MXScan
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