dns.NTT.RU has no MX records.
Question and response
Question
dig dns.NTT.RU. MX
Answer
The response has no answer records.
Authority
NTT.RU. 3600 SOA ns.NTT.RU. george.NTT.RU. 20091585 86400 7200 3600000 172800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0