smtpcorp.com has no AAAA records.
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Google
Domain verification
google-site-verification=lvwYLzIChn0lntGSCBzThx6ywrfrlTESapxFhE0ukvs
Mail.ru
Domain verification
mailru-verification: 125ebef53ef4a8ae
Yahoo
Domain verification
yahoo-verification-key=5jS5HdnNdVxgdJB4DzHOPqtPrHkL4rVeaqRuIF6XUmk=
ada.ns.cloudflare.com
Cloudflare
augustus.ns.cloudflare.com
Cloudflare
Zone apex
Start of authority
Email
Serial
2396939460
Refresh
2h 46m 40s
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40m
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7d
Negative cache TTL
30m