Relay denied com Postfix+SASL

["Helio Jose Poffo Junior" <helio.poffo@abilis.com.br>]

Boa tarde, 

Configurei um servidor de email para um cliente utilizando postfix+sasl, porem esta dando relay denied quando esse cliente tenta enviar email de fora de sua rede. Alguem tem ideia do que possa ser?
Já procurei na net, porem não axei nada (talvez a forma de procurar tenha sido errada)

Abaixo o main.cf.

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command_directory = /usr/sbin
daemon_directory = /usr/libexec/postfix

content_filter = smtp-amavis:[127.0.0.1]:10024
soft_bounce = yes

maps_rbl_domains = relays.ordb.org, bl.spamcop.net, sbl.spamhaus.org, blackholes.mail-abuse.org, relays.osirusoft.com

smtpd_banner = $myhostname ESMTP $mail_name
smtpd_helo_required = yes

smtpd_helo_restrictions =
        reject_invalid_hostname

smtpd_sender_restrictions =
        permit_sasl_authenticated,
        permit_mynetworks,
        reject_unknown_sender_domain,
        reject_invalid_hostname,
        reject_unauth_destination,
        reject_non_fqdn_sender,
        reject_unknown_recipient_domain

smtpd_client_restrictions =
        permit_mynetworks,
        permit_sasl_authenticated

smtpd_recipient_restrictions =
        reject_rbl_client, 
        permit_sasl_authenticated,
        permit_auth_destination,
        permit_mynetworks,
        reject_unauth_destination,
        reject_unknown_sender_domain,
        reject_non_fqdn_sender,
        reject_non_fqdn_recipient


setgid_group = postdrop
biff = no

myhostname = mail.dominio.com.br
mydomain = aragaobus.com.br
alias_maps = hash:/etc/postfix/aliases
alias_database = hash:/etc/postfix/aliases
myorigin = $mydomain
mydestination = localhost.$mydomain, localhost, $myhostname, $mydomain
relayhost =
relay_domains = $mydestination
mynetworks_style = host
mynetworks = 127.0.0.0/8 10.0.12.0/24 10.0.11.0/24
mailbox_command = /usr/bin/procmail -a "$EXTENSION"
recipient_delimiter = +
append_dot_mydomain = no
home_mailbox = Mailbox
mail_spool_directory = /var/spool/mail

allow_mail_to_files = alias,forward,include

broken_sasl_auth_clients = yes
smtpd_sasl_auth_enable = yes
smtpd_sasl_security_options = noanonymous
smtpd_sasl_local_domain = $mydomain
smtpd_sasl_application_name = smtpd

unknown_local_recipient_reject_code = 450
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Obrigado por qualquer ajuda.

--
Hélio José Poffo Junior
helio.poffo@abilis.com.br

ABILIS TECNOLOGIA LTDA
Tel: (47) 3026-8604
Joinville - SC - Brasil