mail.24hc.ru has no MX records.
Question and response
Question
dig mail.24hc.ru. MX
Answer
The response has no answer records.
Authority
24hc.ru. 60 SOA isp.24hc.ru. info.itcom.info. 2017052253 60 3600 604800 86400
Additional
. 0 OPT ; payload 1680, xrcode 0, version 0, flags 0