ns.ti.com has no MX records.
Question and response
Question
dig ns.ti.com. MX
Answer
The response has no answer records.
Authority
ti.com. 30 SOA oqdibfd.itg.ti.com. hostmaster.ti.com. 2013108351 900 300 2419200 30
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0