mx.lobo.net has no CNAME records.
Question and response
Question
dig mx.lobo.net. NS
Answer
The response has no answer records.
Authority
lobo.net. 1506 SOA sleepy.lobo.net. hostmaster.lobo.net. 2026022201 3600 3600 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0