Question and response
Question
dig CPMS.RU. MX
Answer
CPMS.RU. 21600 MX 10 mx.yandex.net.
Authority
CPMS.RU. 900 NS dns2.yandex.net.
CPMS.RU. 900 NS dns1.yandex.net.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0