Question and response
Question
dig mx.obcity.ru. NS
Answer
mx.obcity.ru. 5 CNAME mx.yandex.ru.
Authority
yandex.ru. 900 SOA ns1.yandex.ru. sysadmin.yandex-team.ru. 2023037885 600 300 2592000 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0