_spfv4.mailcloud.com.tw has no NS records.
NS records for this zone are defined at mailcloud.com.tw.
NS records for this zone are defined at mailcloud.com.tw.
Question and response
Question
dig _spfv4.mailcloud.com.tw. NS
Answer
The response has no answer records.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0