core.avantel.ru has no MX records.
Question and response
Question
dig core.avantel.ru. MX
Answer
The response has no answer records.
Authority
core.avantel.ru. 3600 SOA ns.avantel.ru. noc.avantel.ru. 2007121701 3600 1800 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0