mail.ttidc.com.tr has no CNAME records.
Question and response
Question
dig mail.ttidc.com.tr. NS
Answer
The response has no answer records.
Authority
ttidc.com.tr. 8224 SOA ns1.ttidc.com.tr. dnsadmin.ttidc.com.tr. 2020101001 21600 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0