mx.junis.ni.ac.rs has no CNAME records.
Question and response
Question
dig mx.junis.ni.ac.rs. NS
Answer
The response has no answer records.
Authority
junis.ni.ac.rs. 10800 SOA ban.junis.ni.ac.rs. hostmaster.ni.ac.rs. 2026021201 14400 3600 2419200 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0