mail3.nirc.edu has no CNAME records.
Question and response
Question
dig mail3.nirc.edu. NS
Answer
The response has no answer records.
Authority
nirc.edu. 300 SOA ns29.1and1.com. hostmaster.1and1.com. 2016121667 28800 7200 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0