filesender.rcub.bg.ac.rs has no MX records.
Question and response
Question
dig filesender.rcub.bg.ac.rs. MX
Answer
The response has no answer records.
Authority
rcub.bg.ac.rs. 3600 SOA ns.rcub.bg.ac.rs. mreza.rcub.bg.ac.rs. 2026020500 10800 3600 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0