dns5.hitrost.com has no MX records.
Question and response
Question
dig dns5.hitrost.com. MX
Answer
The response has no answer records.
Authority
hitrost.com. 21600 SOA dns1.hitrost.net. hostmaster.hitrost.com. 2024092602 7200 3600 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0