movil.vtr.net has no MX records.
Question and response
Question
dig movil.vtr.net. MX
Answer
The response has no answer records.
Authority
movil.vtr.net. 10800 SOA ns00.vtr.net. hostmaster.vtr.net. 2013012800 43200 900 1814400 10800
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0