mx2.lasotel.net has no CNAME records.
Question and response
Question
dig mx2.lasotel.net. NS
Answer
The response has no answer records.
Authority
lasotel.net. 8062 SOA ns1.lasotel.net. dns.lasotel.net. 2026011801 21600 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0