mail.infomir.com.ua has no MX records.
Question and response
Question
dig mail.infomir.com.ua. MX
Answer
The response has no answer records.
Authority
infomir.com.ua. 86400 SOA ns1.infomir.com.ua. hostmaster.infomir.com.ua. 2026020917 28800 7200 2419200 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0