ns2a.rit.edu has no MX records.
Question and response
Question
dig ns2a.rit.edu. MX
Answer
The response has no answer records.
Authority
rit.edu. 3600 SOA ns1a.rit.edu. root.rit.edu. 139580453 3600 600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0