mx01.ber01.as59645.net has no CNAME records.
Question and response
Question
dig mx01.ber01.as59645.net. NS
Answer
The response has no answer records.
Authority
ber01.as59645.net. 3600 SOA dns.aperture-labs.org. contact.as59645.net. 2026022602 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0