mail.tupu360.cn has no MX records.
Question and response
Question
dig mail.tupu360.cn. MX
Answer
The response has no answer records.
Authority
tupu360.cn. 180 SOA f1g1ns1.dnspod.net. freednsadmin.dnspod.com. 1770366161 3600 180 1209600 180
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0