QDNS.RU has no MX records.
Question and response
Question
dig QDNS.RU. MX
Answer
The response has no answer records.
Authority
QDNS.RU. 600 SOA ns3-l2.nic.RU. it.quantumart.RU. 65012723 14400 3600 2592000 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0