Test
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ICMP ping
TLS connection
HTTP/HTTPS connection
Reverse/forward DNS match
DNS host lookup
DNS MX lookup
DNS NS lookup
DNS NS2 lookup (TLS capability lookup)
DNS HTTPS lookup
DNS SVCB lookup
DNS TXT lookup
SPF checker
Host/URL
For TLS-test: TCP port. For SPF: MTA IP
Query JCloud authorative (DNS-tests)