mail.adaptlinkbr.com.br.adaptlink.com.br has no CNAME records.
Question and response
Question
dig mail.adaptlinkbr.com.br.adaptlink.com.br. NS
Answer
The response has no answer records.
Authority
adaptlink.com.br. 2789 SOA ns1.adaptlink.com.br. noc.adaptlink.com.br. 2025072800 3600 600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0