mail.vitelcom.net has no MX records.
Question and response
Question
dig mail.vitelcom.net. MX
Answer
The response has no answer records.
Authority
vitelcom.net. 150 SOA Icc.vitelcom.net. root.vitelcom.net. 946415640 10800 3600 604800 150
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0