cn has no MX records.
Question and response
Question
dig cn. MX
Answer
The response has no answer records.
Authority
cn. 21600 SOA a.dns.cn. root.cnnic.cn. 2034479965 7200 3600 2419200 21600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0