ns2.dts.net.ua has no MX records.
Question and response
Question
dig ns2.dts.net.ua. MX
Answer
The response has no answer records.
Authority
dts.net.ua. 3600 SOA ns.dts.net.ua. hostmaster.dts.net.ua. 2025103100 28800 7200 604800 7200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0