subnet.0x2a.com.ua has no MX records.
Question and response
Question
dig subnet.0x2a.com.ua. MX
Answer
The response has no answer records.
Authority
0x2a.com.ua. 3600 SOA 0x2a.com.ua. support.0x2a.com.ua. 2014012111 10800 3600 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0