mxp.altice.pt has no CNAME records.
Question and response
Question
dig mxp.altice.pt. NS
Answer
The response has no answer records.
Authority
altice.pt. 186 SOA ns1.ptempresas.pt. na.na.pt. 2022102678 7200 3600 2419200 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0