[postfix-es] error 451 Temporary lookup failure

[Subsonic]

Hola, esta es la primera vez que trato de configurar postfix."Supuestamente" he configurado para que reciba mails para el dominio tuxbox.com.ar, el cual tiene sus dns (mx) apuntando a mi maquina, pero cuando envio un email a cualquier direccion @tuxbox.com.ar (obvio que existentes) me da el siguiente error:



tail /var/log/mail/info

Jul  2 23:07:15 apollo postfix/master[23659]: daemon started -- version 2.0.6
Jul  2 23:13:13 apollo postfix/smtpd[23679]: connect from unknown[216.55.26.70]
Jul  2 23:13:13 apollo postfix/smtpd[23679]: C810C17679: client=unknown[216.55.26.70]
Jul  2 23:13:14 apollo postfix/smtpd[23679]: C810C17679: reject: RCPT from unknown[216.55.26.70]: 451 <info en tuxbox.com.ar>: Temporary lookup failure; from=<subsonic en yifan.net> proto=SMTP helo=<mail.yifansoft.com>
Jul  2 23:13:15 apollo postfix/cleanup[23682]: 76C371767A: message-id=<20030703021315.76C371767A en apollo.mtx.nvn>
Jul  2 23:13:15 apollo postfix/nqmgr[23665]: 76C371767A: from=<double-bounce en apollo.mtx.nvn>, size=659, nrcpt=1 (queue active)
Jul  2 23:13:15 apollo postfix/smtpd[23679]: disconnect from unknown[216.55.26.70]
Jul  2 23:13:15 apollo postfix/local[23683]: 76C371767A: to=<info en apollo.mtx.nvn>, orig_to=<postmaster>, relay=local, delay=0, status=sent ("|/usr/bin/procmail -Y -a $DOMAIN")
Jul  2 23:20:32 apollo postfix/smtpd[23703]: connect from unknown[216.55.26.70]
Jul  2 23:20:33 apollo postfix/smtpd[23703]: 612DE176CE: client=unknown[216.55.26.70]
Jul  2 23:20:33 apollo postfix/smtpd[23703]: 612DE176CE: reject: RCPT from unknown[216.55.26.70]: 451 <info en tuxbox.com.ar>: Temporary lookup failure; from=<subsonic en yifan.net> proto=SMTP helo=<mail.yifansoft.com>
Jul  2 23:20:35 apollo postfix/cleanup[23706]: 10F9C176CF: message-id=<20030703022035.10F9C176CF en apollo.mtx.nvn>
Jul  2 23:20:35 apollo postfix/nqmgr[23665]: 10F9C176CF: from=<double-bounce en apollo.mtx.nvn>, size=659, nrcpt=1 (queue active)
Jul  2 23:20:35 apollo postfix/smtpd[23703]: disconnect from unknown[216.55.26.70]
Jul  2 23:20:35 apollo postfix/local[23707]: 10F9C176CF: to=<info en apollo.mtx.nvn>, orig_to=<postmaster>, relay=local, delay=0, status=sent ("|/usr/bin/procmail -Y -a $DOMAIN")

postconf -n
alias_database = hash:/etc/postfix/aliases
alias_maps = hash:/etc/postfix/aliases
body_checks = regexp:/etc/postfix/body_checks
command_directory = /usr/sbin
config_directory = /etc/postfix
daemon_directory = /usr/lib/postfix
debug_peer_level = 2
delay_warning_time = 4
header_checks = regexp:/etc/postfix/header_checks
inet_interfaces = all
local_recipient_maps = $alias_maps unix:passwd.byname
mail_owner = postfix
mail_spool_directory = /var/spool/mail
mailbox_command = /usr/bin/procmail -Y -a $DOMAIN
mailq_path = /usr/bin/mailq.postfix
manpage_directory = /usr/share/man
mydestination = $myhostname, localhost.$mydomain, $mydomain
mydomain = tuxbox.com.ar
myhostname = apollo.mtx.nvn
mynetworks = 127.0.0.1, 10.0.0.0/8
newaliases_path = /usr/bin/newaliases.postfix
queue_directory = /var/spool/postfix
readme_directory = /usr/share/doc/postfix-2.0.6/README_FILES
sample_directory = /usr/share/doc/postfix-2.0.6/samples
sendmail_path = /usr/sbin/sendmail.postfix
setgid_group = postdrop
smtpd_banner = ESMTP (Linuix)
smtpd_recipient_restrictions = permit_mynetworks reject_unauth_destination
unknown_local_recipient_reject_code = 450

Esta bien la configuracion? alguien me puede ayudar?
Gracias.
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