Question and response
Question
dig smtp1-ru1.mail-messaging.com. A
Answer
smtp1-ru1.mail-messaging.com. 300 A 202.22.163.20
Authority
mail-messaging.com. 172800 NS ns-1318.awsdns-36.org.
mail-messaging.com. 172800 NS ns-1790.awsdns-31.co.uk.
mail-messaging.com. 172800 NS ns-235.awsdns-29.com.
mail-messaging.com. 172800 NS ns-792.awsdns-35.net.
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0