ns3.dns.ucla.edu has no MX records.
Question and response
Question
dig ns3.dns.ucla.edu. MX
Answer
The response has no answer records.
Authority
ucla.edu. 900 SOA ib00f2.csb1.ucla.net. hostmaster.ucla.edu. 2012110312 10800 3600 2419200 900
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0