ti.com.tw has no MX records.
Question and response
Question
dig ti.com.tw. MX
Answer
The response has no answer records.
Authority
ti.com.tw. 300 SOA oleibdm.itg.ti.com. hostmaster.ti.com. 14 900 300 4838400 300
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0