tarm-mail-d02.vmailru.net has no MX records.
Question and response
Question
dig tarm-mail-d02.vmailru.net. MX
Answer
The response has no answer records.
Authority
vmailru.net. 60 SOA ns.mail.ru. hostmaster.mail.ru. 3563816313 28800 7200 604800 7200
Additional
. 0 OPT ; payload 512, xrcode 0, version 0, flags 0