mx02.t-com.hr has no CNAME records.
Question and response
Question
dig mx02.t-com.hr. NS
Answer
The response has no answer records.
Authority
t-com.hr. 600 SOA dns1.ht.hr. dns.t.ht.hr. 2602230001 28800 720 604800 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0