a.NIC.RS has no MX records.
Question and response
Question
dig a.NIC.RS. MX
Answer
The response has no answer records.
Authority
NIC.RS. 900 SOA a.NIC.RS. hostmaster.NIC.RS. 2026021305 14400 3600 604800 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0