dns1.cantv.net has no MX records.
Question and response
Question
dig dns1.cantv.net. MX
Answer
The response has no answer records.
Authority
cantv.net. 86400 SOA ns1.cantv.net. hostmaster.cantv.net. 2026011300 86400 7200 2592000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0