mail01.marketing.ti.com has no MX records.
Question and response
Question
dig mail01.marketing.ti.com. MX
Answer
The response has no answer records.
Authority
ti.com. 60 SOA oqdibfd.itg.ti.com. hostmaster.ti.com. 2013108356 900 300 2419200 60
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0