ob1123.obcity.ru has no MX records.
Question and response
Question
dig ob1123.obcity.ru. MX
Answer
The response has no answer records.
Authority
obcity.ru. 10800 SOA ns.obcity.ru. ns1.obcity.ru. 2012020920 43200 3600 1209600 10800
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0