ns2.central01.net has no MX records.
Question and response
Question
dig ns2.central01.net. MX
Answer
The response has no answer records.
Authority
central01.net. 3600 SOA ns1.central01.net. joaopaulo.central01.net. 2026010501 3600 900 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0