mail.scaleway.email has no CNAME records.
Question and response
Question
dig mail.scaleway.email. NS
Answer
The response has no answer records.
Authority
scaleway.email. 3600 SOA ns0.dom.scw.cloud. hostmaster.scaleway.email. 2026030501 86400 7200 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0