mx01.ecn.purdue.edu has no TXT records.
Question and response
Question
dig mx01.ecn.purdue.edu. TXT
Answer
The response has no answer records.
Authority
ecn.purdue.edu. 86400 SOA harbor.ecn.purdue.edu. hostmaster.ecn.purdue.edu. 2389460076 10800 3600 3600000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0