[postfix-es] user unknown in local recipient table

[JPM]

Hola a todos.
Tengo practicamente terminado de configurar postfix con mysql y courier-imap. Los usuarios los tengo metidos en mysql, pero cuando intento enviar desde alguna cuenta de otro proveedor a mi cuenta obtengo este error:

May 23 03:27:16 aixsrv2 postfix/smtpd[266398]: NOQUEUE: reject: RCPT from smtp.telefonica.net[213.4.129.135]: 550 <usuario en midominio.com>: Recipient address rejected: User unknown in local recipient table; from=<yo en telefonica.net> to=<usuario en midominio.com> proto=ESMTP helo=<tnetsmtp1.mail.isp>

Mi postconf -n:
alias_database = dbm:/etc/postfix/aliases
alias_maps = dbm:/etc/postfix/aliases
broken_sasl_auth_clients = yes
command_directory = /usr/sbin
config_directory = /etc/postfix
daemon_directory = /usr/libexec/postfix
default_destination_concurrency_limit = 10
disable_dns_lookups = no
disable_vrfy_command = yes
html_directory = no
local_destination_concurrency_limit = 2
local_recipient_maps = $alias_maps unix:passwd.byname
mail_name = Postfix/MJ-1.03
mail_owner = postfix
mailbox_size_limit = 10485760
mailq_path = /usr/sbin/mailq
manpage_directory = /usr/local/man
maps_rbl_domains = relays.ordb.org list.dsbl.org
maximal_queue_lifetime = 5d
message_size_limit = 10485760
mydestination = $myhostname localhost.$mydomain $mydomain  localhost $transport_maps
mydomain = midominio.com
myhostname = mail.midominio.com
mynetworks = 127.0.0.1 172.26.0.0/24
myorigin = $mydomain
newaliases_path = /usr/sbin/newaliases
notify_classes = resource, software, policy
queue_directory = /var/spool/postfix
readme_directory = /etc/postfix/readmefiles
relay_domains = $mydestination
sample_directory = /etc/postfix
sendmail_path = /usr/lib/sendmail
setgid_group = postdrop
smtpd_banner = $myhostname ESMTP $mail_name ($mail_version)
smtpd_recipient_restrictions = reject_non_fqdn_recipient, permit_sasl_authenticated, permit_mynetworks, check_relay_domains
smtpd_sasl_auth_enable = yes
smtpd_sasl_local_domain = $mydomain
transport_maps = mysql:/etc/postfix/transport.cf
virtual_gid_maps = mysql:/etc/postfix/gids.cf
virtual_mailbox_base = /buzonescorreo
virtual_mailbox_maps = mysql:/etc/postfix/mysql_virt.cf
virtual_uid_maps = mysql:/etc/postfix/uids.cf

Alguna idea ?
Gracias.
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