mx1.staj.turkcell.com.tr has no CNAME records.
Question and response
Question
dig mx1.staj.turkcell.com.tr. NS
Answer
The response has no answer records.
Authority
turkcell.com.tr. 600 SOA ns1.turkcell.com.tr. hostmaster.turkcell.com.tr. 2026030204 7200 3600 604800 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0