ns.pledpodushkin.RU has no MX records.
Question and response
Question
dig ns.pledpodushkin.RU. MX
Answer
The response has no answer records.
Authority
pledpodushkin.ru. 3600 SOA ns.pledpodushkin.ru. root.pledpodushkin.ru. 80420253 3600 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0