BIND is not setup correctly anyway for your domain
Code:
Jan 7 16:49:55 mail02 named[16607]: /etc/bind/db.mail.carlostavares.com.br:4: no TTL specified; using SOA MINTTL instead
Jan 7 16:49:55 mail02 named[16607]: zone mail.carlostavares.com.br/IN: NS '192.168.1.16.mail.carlostavares.com.br' has no address records (A or AAAA)
please post named.conf and the associated zone files.