[Postfix espanol] No encuentro usuario.

[Pablo]

Hola Gente:
En uno de los servidores MX que tengo con postfix tengo un problema que ocurrio sin haber hecho absolutamente ningun cambio.
En los logs tampoco encuentro ningun error grave, ni warning ni nada por el estilo, el problema es que asi de un instante para el otro 
empece a observar los siguientes mensajes en el log:

Apr 30 20:04:58 mx03.osite.com.br postfix/virtual[6343]: 44921A7F3: to=<pedroeneia#osite.com.br en osite.com.br>, relay=virtual, delay=601, status=bounced (unknown user: "pedroeneia#osite.com.br en osite.com.br")
Apr 30 20:04:58 mx03.osite.com.br postfix/qmgr[6287]: 4864BA7C5: from=<ebeper en attglobal.net>, size=162272, nrcpt=1 (queue active)
Apr 30 20:04:58 mx03.osite.com.br postfix/cleanup[6338]: 237E5A7B2: message-id=<20020430170458.237E5A7B2 en mx03.osite.com.br>
Apr 30 20:04:58 mx03.osite.com.br postfix/virtual[6310]: 4864BA7C5: to=<stivanin#osite.com.br en osite.com.br>, relay=virtual, delay=705, status=bounced (unknown user: "stivanin#osite.com.br en osite.com.br")
Apr 30 20:04:58 mx03.osite.com.br postfix/qmgr[6287]: ECEC0A849: from=<>, size=160986, nrcpt=1 (queue active)
Apr 30 20:04:58 mx03.osite.com.br postfix/cleanup[6354]: 524A0A7D6: message-id=<20020430170458.524A0A7D6 en mx03.osite.com.br>
Apr 30 20:04:58 mx03.osite.com.br postfix/virtual[6343]: ECEC0A849: to=<gotademel#osite.com.br en osite.com.br>, relay=virtual, delay=718, status=bounced (unknown user: "gotademel#osite.com.br en osite.com.br")
Apr 30 20:04:58 mx03.osite.com.br postfix/qmgr[6287]: EC5C3A8B8: from=<>, size=51664, nrcpt=1 (queue active)


Unknown user???? Los usuarios si realmente existen y puedo verificarlo con un ldapsearch ........  La primera vez que me sucede algo asi...
Sinceramente no hice ningun cambio, lo percibi cuando comence a ver en los logs....

Cualquier sugerencia me servira!!!
Gracias, 
pablo.

Paso el postconf :
alias_database = ldap:ldapsource
alias_maps = $alias_database
biff = no
command_directory = /usr/sbin
command_time_limit = 30s
config_directory = /etc/postfix
daemon_directory = /usr/libexec/postfix
daemon_timeout = 18000s
debug_peer_level = 2
debug_peer_list = 127.0.0.1
disable_vrfy_command = yes
inet_interfaces = 200.196.255.134, 192.168.0.134, 127.0.0.1
local_destination_concurrency_limit = 2
local_destination_recipient_limit = 1
local_recipient_maps = $alias_database ldap:localrecipients
mail_owner = postfix
mail_spool_directory = /var/spool/mail
mailbox_size_limit = 51200000
mailq_path = /usr/bin/mailq
manpage_directory = /usr/man
maps_rbl_domains = relays.mail-abuse.org
maximal_backoff_time = 4000s
maximal_queue_lifetime = 5d
mydestination = $myhostname, localhost.$mydomain, $mydomain, mail.$mydomain
mydomain = osite.com.br
myhostname = mx03.osite.com.br
mynetworks = 127.0.0.0/8
myorigin = $mydomain
newaliases_path = /usr/bin/newaliases
qmgr_message_active_limit = 10000
qmgr_message_recipient_limit = 50
qmqpd_timeout = 300s
queue_directory = /var/spool/postfix
readme_directory = no
recipient_delimiter = 
relay_domains = $mydestination, $transport_maps
sample_directory = /etc/postfix
sendmail_path = /usr/lib/sendmail
setgid_group = postdrop
smtp_destination_concurrency_limit = $default_destination_concurrency_limit
smtp_destination_recipient_limit = $default_destination_recipient_limit
smtpd_client_restrictions = permit_mynetworks        check_client_access regexp:/etc/postfix/access        reject_maps_rbl
smtpd_etrn_restrictions = permit_mynetworks        check_client_access regexp:/etc/postfix/access         reject_maps_rbl
smtpd_helo_required = yes
smtpd_helo_restrictions = check_client_access regexp:/etc/postfix/access,          reject_maps_rbl
smtpd_recipient_restrictions = permit_mynetworks        check_recipient_access regexp:/etc/postfix/antispam.pablo        reject_maps_rbl        check_sender_access regexp:/etc/postfix/senders_deny        check_relay_domains
smtpd_sender_restrictions = 
smtpd_soft_error_limit = 10
smtpd_timeout = 300s
stale_lock_time = 500s
transport_maps = ldap:transport
transport_retry_time = 60s
trigger_timeout = 10s
verp_delimiter_filter = -=+
virtual_gid_maps = static:6
virtual_mailbox_base = /MAIL
virtual_mailbox_limit = 51200000
virtual_mailbox_maps = ldap:vmailbox
virtual_maps = $alias_database ldap:virtual
virtual_uid_maps = static:101
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