adns2.doit.wisc.edu has no MX records.
Question and response
Question
dig adns2.doit.wisc.edu. MX
Answer
The response has no answer records.
Authority
doit.wisc.edu. 600 SOA adns1.doit.wisc.edu. hostmaster.doit.wisc.edu. 14568 7200 1800 3628800 600
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0