pmdf01t.rit.edu has no MX records.
Question and response
Question
dig pmdf01t.rit.edu. MX
Answer
The response has no answer records.
Authority
rit.edu. 3600 SOA ns1a.rit.edu. root.rit.edu. 139765716 3600 600 604800 3600
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0