shell:$ nslookup -timeout=2 -retry=1 'mail-tester.com'
Server: 1.1.1.1
Address: 1.1.1.1#53
Non-authoritative answer:
Name: mail-tester.com
Address: 104.21.64.163
Name: mail-tester.com
Address: 172.67.152.196
Name: mail-tester.com
Address: 2606:4700:3033::ac43:98c4
Name: mail-tester.com
Address: 2606:4700:3036::6815:40a3
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