mx01.prolan.pf has no CNAME records.
Question and response
Question
dig mx01.prolan.pf. NS
Answer
The response has no answer records.
Authority
prolan.pf. 4356 SOA ns1.vini.pf. system.onati.pf. 2025040901 3600 900 1209600 43200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0