ns.mts.com.ua has no MX records.
Question and response
Question
dig ns.mts.com.ua. MX
Answer
The response has no answer records.
Authority
mts.com.ua. 3600 SOA ns.mts.com.ua. hostmaster.mts.com.ua. 2024052300 3600 1800 3600000 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0