mx2.sogetel.net has no CNAME records.
Question and response
Question
dig mx2.sogetel.net. NS
Answer
The response has no answer records.
Authority
sogetel.net. 600 SOA galilee1.sogetel.net. network-admin.sogetel.net. 2026022701 3600 1800 1209600 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0