sirkan.vts.su.ac.rs has no MX records.
Question and response
Question
dig sirkan.vts.su.ac.rs. MX
Answer
The response has no answer records.
Authority
vts.su.ac.rs. 3600 SOA ns1.vts.su.ac.rs. hostmaster.vts.su.ac.rs. 2025102001 10800 3600 604800 38400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0