dns2.mail724.com has no CNAME records.
Question and response
Question
dig dns2.mail724.com. NS
Answer
The response has no answer records.
Authority
mail724.com. 4226 SOA ns1.mail724.com. farshid.digiturunc.com. 2026022501 3600 1800 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0