Question and response
Question
dig smtp.antispamcloud.com. A
Answer
smtp.antispamcloud.com. 600 A 149.13.75.71
smtp.antispamcloud.com. 600 A 154.59.104.24
smtp.antispamcloud.com. 600 A 154.59.193.125
Authority
antispamcloud.com. 172800 NS ns-1287.awsdns-32.org.
antispamcloud.com. 172800 NS ns-1997.awsdns-57.co.uk.
antispamcloud.com. 172800 NS ns-6.awsdns-00.com.
antispamcloud.com. 172800 NS ns-781.awsdns-33.net.
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0