mailgateway01.taifu.net.tw has no MX records.
Question and response
Question
dig mailgateway01.taifu.net.tw. MX
Answer
The response has no answer records.
Authority
taifu.net.tw. 3600 SOA nsp1.hinet.net. hostmaster.hinet.net. 1772910001 300 1800 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0