ns4.sn.co.rs has no MX records.
Question and response
Question
dig ns4.sn.co.rs. MX
Answer
The response has no answer records.
Authority
sn.co.rs. 1800 SOA ns1.sn.co.rs. hostmaster.sn.co.rs. 2026022602 10800 3600 1209600 1800
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0