dns02.ono.com has no MX records.
Question and response
Question
dig dns02.ono.com. MX
Answer
The response has no answer records.
Authority
ono.com. 3600 SOA dns01.ono.com. root.ono.com. 2024081301 3600 3600 604800 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0