ns.mtel.net has no MX records.
Question and response
Question
dig ns.mtel.net. MX
Answer
The response has no answer records.
Authority
mtel.net. 3600 SOA ns.mtel.net. sysadmin.mtel.net. 2025070301 3600 900 1209600 43200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0