dns.unishield.pro has no MX records.
Question and response
Question
dig dns.unishield.pro. MX
Answer
The response has no answer records.
Authority
unishield.pro. 900 SOA kiki.bunny.net. hostmaster.bunny.net. 2021670269 7200 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0