csb1.ucla.net has no MX records.
Question and response
Question
dig csb1.ucla.net. MX
Answer
The response has no answer records.
Authority
csb1.ucla.net. 900 SOA ib00f2.csb1.ucla.net. hostmaster.ucla.edu. 19 10800 3600 2419200 900
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0