ns.cneinfo.com has no MX records.
Question and response
Question
dig ns.cneinfo.com. MX
Answer
The response has no answer records.
Authority
cneinfo.com. 3600 SOA ns.cneinfo.com. mail.cneinfo.com. 2025101701 10800 3600 432000 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0