Sorry, I shoud've included those in the intial post.

Here it is:
postconf -n
alias_database = hash:/etc/aliases
alias_maps = $alias_database
bounce_size_limit = 65536
broken_sasl_auth_clients = yes
canonical_maps = hash:/etc/postfix/canonical
command_directory = /usr/sbin
config_directory = /etc/postfix
content_filter = smtp:127.0.0.1:21883
daemon_directory = /usr/lib/postfix
debug_peer_level = 2
default_destination_concurrency_limit = 10
default_privs = nobody
default_transport = smtp
disable_vrfy_command = yes
header_size_limit = 32768
inet_interfaces = 127.0.0.1, 201.24.110.4
local_destination_concurrency_limit = 2
local_recipient_maps = ldap:ldapvirtual
mail_owner = postfix
mailbox_transport = cyrus
message_size_limit = 32768000
mydestination = $mydomain, $myhostname, localhost.$mydomain,
/etc/postfix/destination, hash:/etc/postfix/destination_domains
mydomain = gsurf.com.br
myhostname = silveira.gsurf.com.br
mynetworks = 201.35.229.219/32, 201.64.77.234/32, 200.247.142.184/32,
201.24.110.0/24, 127.0.0.0/8, 201.24.111.0/24, 201.25.197.0/24
myorigin = /etc/mailname
program_directory = /usr/lib/postfix
queue_directory = /var/spool/postfix
relay_domains = $mydomain, $myhostname, localhost.$mydomain,
/etc/postfix/destination, hash:/etc/postfix/relay_domains
smtpd_banner = $myhostname ESMTP $mail_name (GSurf)
smtpd_recipient_limit = 99
smtpd_recipient_restrictions = permit_mynetworks,
permit_sasl_authenticated, check_relay_domains
smtpd_sasl_auth_enable = yes
smtpd_sasl_local_domain = $myhostname
smtpd_sasl_security_options = noanonymous
smtpd_timeout = 180
transport_maps = hash:/etc/postfix/transport
virtual_maps = ldap:ldapvirtual

Log:
May 8 23:10:49 silveira postfix/smtp[6583]: warning: no MX host for
labramo.com.br has a valid A record
May 8 23:10:50 silveira postfix/smtp[6583]: AFABB5FD71:
to=<vendas1@labramo.com.br>, relay=none, delay=20, status=deferred
(Name service error for labramo.com.br: Host not found, try again)

Thank you,
Aless.