[postfix-es] S

[augustocasagrande en gmail.com]

Saludos a la lista !
Quería hacer una consulta . Estoy corriendo Postfix 2.2.9 sobre Gnu/linux.
Tengo 2 servidores de correos , uno en la DMZ filtrando spam , junto a  
otros servicios. Y el otro servidor se encuentra en la Lan, recibiendo las  
peticiones de los clientes descargando y enviando correo.
Mi consulta se basa en el servidor que esta en la DMZ . Estoy recibiendo  
correo externo , desde una o unas direcciones que las RBL no alcanzan a  
filtrar y estos correos "provienen" de postmaster en midominio.com , con  
destinatario postmaster en midominio.com. Por supuesto mi servidor ve que es  
una direccion válida de destino y me lo entrega.
¿ Que regla me esta faltando para que me deniegue correo externo , en el  
que figura mi propio dominio (midominio.com)?
Este es mi postconf -n :
alias_maps = hash:/etc/aliases
biff = no
body_checks = regexp:/etc/postfix/body-deny
canonical_maps = hash:/etc/postfix/canonical
command_directory = /usr/sbin
config_directory = /etc/postfix
daemon_directory = /usr/lib/postfix
debug_peer_level = 2
defer_transports =
delay_warning_time = 4h
disable_dns_lookups = no
disable_mime_output_conversion = no
fast_flush_purge_time = 3d
html_directory = /usr/share/doc/packages/postfix/html
inet_interfaces = mi-ip-interna, mi-ip-externa, localhost
inet_protocols = all
local_recipient_maps =
local_transport = error : local mail delivery disabled
mail_owner = postfix
mail_spool_directory = /var/mail
mailbox_command =
mailbox_size_limit = 0
mailbox_transport =
mailq_path = /usr/bin/mailq
manpage_directory = /usr/share/man
masquerade_classes = envelope_sender, header_sender, header_recipient
masquerade_domains = $mydomain
masquerade_exceptions = root
message_size_limit = 10240000
mydestination =
mydomain = midominio.com
myhostname = host2.midominio.com
mynetworks = ip-de-mi-servidor-interno-LAN
mynetworks_style = subnet
myorigin = $mydomain
newaliases_path = /usr/bin/newaliases
queue_directory = /var/spool/postfix
readme_directory = /usr/share/doc/packages/postfix/README_FILES
relay_domains = midominio.com
relayhost =
relocated_maps = hash:/etc/postfix/relocated
sample_directory = /usr/share/doc/packages/postfix/samples
sender_canonical_maps = hash:/etc/postfix/sender_canonical
sendmail_path = /usr/sbin/sendmail
setgid_group = maildrop
smtp_sasl_auth_enable = no
smtp_use_tls = no
smtpd_client_restrictions =
smtpd_delay_reject = yes
smtpd_helo_required = yes
smtpd_helo_restrictions = permit_mynetworks, check_helo_access  
hash:/etc/postfix/helo_access, reject_non_fqdn_sender,  
reject_invalid_hostname, permit
smtpd_recipient_restrictions = check_recipient_access  
hash:/etc/postfix/access_alias_local,reject_unauth_pipelining,  
reject_non_fqdn_sender,reject_unknown_recipient_domain,permit_mynetworks,reject_unauth_destination,reject_non_fqdn_recipient,reject_rbl_client  
cbl.abuseat.org, reject_rbl_client sbl.spamhaus.org,reject_rbl_client  
pbl.spamhaus.org,reject_rbl_client sbl-xbl.spamhaus.org,permit
smtpd_sasl_auth_enable = no
smtpd_sender_restrictions = permit_mynetworks, reject_non_fqdn_sender,  
reject_unknown_sender_domain, permit
smtpd_use_tls = no
strict_8bitmime = no
strict_rfc821_envelopes = no
transport_maps = hash:/etc/postfix/transport
unknown_local_recipient_reject_code = 550
virtual_alias_domains = hash:/etc/postfix/virtual
virtual_alias_maps = hash:/etc/postfix/virtual

Muchas gracias, saludos.
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