[Postfix-es] tengo un problema

[RDM]

  Cuando mando mails desde mi casilla en el mi dominio a otro correo de mi =
    dominio no tengo ningun problema, Cuando mando desde una casilla en mi =
    dominio a una casilla de otro dominio el mensaje de error que recibo en =
    el cliente es "Relaying not allowed", cuando lo quiero mandar desde una =
    casilla de otro dominio a una casilla de mi dominio el mesaje que recibo =
    es "Relay access Denied".
    El archivo de zona de mi dominio esta en un servidor detras de un router
    $TTL 3D
    recauda.com.uy. IN SOA server.xxxx.xxx.xx.  root.localhost. (
      42  ; serial (d. adams)
      2D  ; refresh
      4H  ; retry
      6W  ; expiry
      1W )  ; minimum
      IN NS  server.xxxx.xxx.xx.
      IN A  200.40.49.106
      IN MX  10 correo.xxxx.xxx.xx.
    server  IN A  200.40.49.106
    correo  IN A  200.40.49.106
    www  IN CNAME server
    smtp  IN CNAME server
    Mi archivo de configuracion main.cf es el siguiente

- Ignorados:
    command_directory =3D /usr/sbin
    
    daemon_directory =3D /usr/lib/postfix
    
    unknown_local_recipient_reject_code =3D 550
    
    myhostname =3D server.xxxxx.xxx.xx
    mydomain =3D xxxxx.xxx.xx
    myorigin =3D $mydomain
    mydestination =3D $myhostname, localhost.$mydomain, $mydomain
    mynetwork =3D 127.0.0.0/8 192.168.1.0/100
    # 192.168.1.0/100
    relayhost =3D [server.xxxxx.xxx.xx]
    
    debug_peer_level =3D 2
    
    debugger_command =3D
      PATH=3D/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin
      xxgdb $daemon_directory/$process_name $process_id & sleep 5
    
    sendmail_path =3D /usr/sbin/sendmail
    
    newaliases_path =3D /usr/bin/newaliases
    
    mailq_path =3D /usr/bin/mailq
    
    setgid_group =3D maildrop
    
    html_directory =3D /usr/share/doc/packages/postfix/html
    
    manpage_directory =3D /usr/share/man
    
    sample_directory =3D /usr/share/doc/packages/postfix/samples
    
    readme_directory =3D /usr/share/doc/packages/postfix/README_FILES
    inet_protocols =3D all
    biff =3D no
    mail_spool_directory =3D /var/mail
    canonical_maps =3D hash:/etc/postfix/canonical
    virtual_maps =3D hash:/etc/postfix/virtual
    relocated_maps =3D hash:/etc/postfix/relocated
    transport_maps =3D hash:/etc/postfix/transport
    sender_canonical_maps =3D hash:/etc/postfix/sender_canonical
    masquerade_exceptions =3D root
    masquerade_classes =3D envelope_sender, header_sender, header_recipient
    program_directory =3D /usr/lib/postfix
    masquerade_domains =3D $mydomain
    defer_transports =3D=20
    disable_dns_lookups =3D no
    mailbox_transport =3D=20
    strict_8bitmime =3D no
    disable_mime_output_conversion =3D no
    smtpd_sender_restrictions =3D hash:/etc/postfix/access
    strict_rfc821_envelopes =3D no
    smtpd_recipient_restrictions =3D =
    permit_mynetworks,reject_unauth_destination
    smtp_sasl_auth_enable =3D no
    smtpd_sasl_auth_enable =3D no
    smtpd_use_tls =3D no
    smtp_use_tls =3D no
    alias_maps =3D hash:/etc/aliases
    mailbox_size_limit =3D 0
    message_size_limit =3D 10240000
    
    Si alguien tiene alguna sugerencia desde ya les agradezco.-
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