mail.it7.com.ua has no MX records.
Question and response
Question
dig mail.it7.com.ua. MX
Answer
The response has no answer records.
Authority
it7.com.ua. 600 SOA nsa4.srv53.net. support.dnshosting.org. 1676479807 1800 600 2419200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0