ns1a.rit.edu has no MX records.
Question and response
Question
dig ns1a.rit.edu. MX
Answer
The response has no answer records.
Authority
rit.edu. 3600 SOA ns1a.rit.edu. root.rit.edu. 139719945 3600 600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0