list.dnspod.net has no MX records.
Question and response
Question
dig list.dnspod.net. MX
Answer
The response has no answer records.
Authority
dnspod.net. 180 SOA ns3.dnsv2.com. level3dnsadmin.dnspod.com. 1770974979 3600 180 1209600 180
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0