b.nic.CL has no MX records.
Question and response
Question
dig b.nic.CL. MX
Answer
The response has no answer records.
Authority
nic.CL. 900 SOA a.nic.CL. dnsadmin.nic.CL. 2026022423 21600 7200 2592000 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0