ns.turk.net has no MX records.
Question and response
Question
dig ns.turk.net. MX
Answer
The response has no answer records.
Authority
turk.net. 3600 SOA ns.turk.net. dnsadmin.turk.net. 2026020710 10800 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0