titan.quantumart.ru has no MX records.
Question and response
Question
dig titan.quantumart.ru. MX
Answer
The response has no answer records.
Authority
quantumart.ru. 3600 SOA ns01.qdns.ru. it.quantumart.ru. 11338 3600 600 86400 3600
Additional
. 0 OPT ; payload 4000, xrcode 0, version 0, flags 0