mx2.qiye.aliyun.com has no CNAME records.
Question and response
Question
dig mx2.qiye.aliyun.com. NS
Answer
The response has no answer records.
Authority
qiye.aliyun.com. 600 SOA ns1.alibabadns.com. hostmaster.alibabadns.com. 2018101219 3600 1200 86400 360
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0