mail.bitcare.pt has no CNAME records.
Question and response
Question
dig mail.bitcare.pt. NS
Answer
The response has no answer records.
Authority
bitcare.pt. 10698 SOA ns1.ciberserver.com. status.ciberconceito.com. 2026021303 3600 1800 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0