ats.24hc.ru has no MX records.
Question and response
Question
dig ats.24hc.ru. MX
Answer
The response has no answer records.
Authority
ats.24hc.ru. 3600 NS n2.24hc.ru.
ats.24hc.ru. 3600 NS n1.24hc.ru.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0