mail2.lpnet.com.br has no CNAME records.
Question and response
Question
dig mail2.lpnet.com.br. NS
Answer
The response has no answer records.
Authority
lpnet.com.br. 634 SOA dns1.lpnet.com.br. lpnet.lpnet.com.br. 2024120304 1200 1200 2419200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0