Question and response
Question
dig ZSTTK.RU. MX
Answer
zsttk.ru. 120 MX 5 mx.zsttk.ru.
zsttk.ru. 120 MX 10 mx.ipv6.zsttk.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0