mx01.t-net.net.ve has no MX records.
Question and response
Question
dig mx01.t-net.net.ve. MX
Answer
The response has no answer records.
Authority
t-net.net.ve. 86400 SOA dns1.telcel.net.ve. root.dns1.telcel.net.ve. 2026012901 3600 1800 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0