[postfix-es] error en postfix 2

[Dionisio Ruiz de Zarate]

Hola he configurado un postfix 2, con mucha ayuda vuestra, la que agradezco
de antemano.
la cosa es que veo numerosos errores (REJECT) de direcciones de correo de
las que hasta ahora me han enviado emails sin problemas.
el error tipo es este:

Jun 23 19:27:55 server postfix/smtpd[13763]: E3ABA1D494: reject: RCPT from
unknown[XXX.XXX.XXX.XXX]: 450 Client host rejected: cannot find your
hostname, [XXX.XXX.XXX.XXX]; from=<remitente en dominio.com>
to=<midireccion en dominio.com> proto=ESMTP helo=<host.remoto.com>

Me podeis ayudar , no a que no salga esto en los logs sino a recibir bien
estos correos?

La salida postconf -n de mi postfix es:
alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
broken_sasl_auth_clients = yes
canonical_maps = hash:/etc/postfix/canonical
command_directory = /usr/sbin
config_directory = /etc/postfix
content_filter = vscan:
daemon_directory = /usr/lib/postfix
debug_peer_level = 2
defer_transports =
inet_interfaces = all
mail_owner = postfix
mail_spool_directory = /var/mail
mailbox_command =
mailbox_size_limit = 51200000
mailbox_transport =
mailq_path = /usr/bin/mailq
manpage_directory = /usr/share/man
masquerade_classes = envelope_sender, header_sender, header_recipient
masquerade_domains =
masquerade_exceptions = root
message_size_limit = 10240000
mydestination = localhost.$mydomain,$myhostname,dominio1.com, dominio2.com,
dominio3.comm,cominiox.com
mydomain = dominio1.com
myhostname = server.dominio1.com
newaliases_path = /usr/bin/newaliases
program_directory = /usr/lib/postfix
queue_directory = /var/spool/postfix
readme_directory = /usr/share/doc/packages/postfix/README_FILES
relay_domains = $mydestination
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 = yes
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
smtpd_client_restrictions =
permit_mynetworks,permit_sasl_authenticated,reject_unknown_client
smtpd_helo_required = yes
smtpd_helo_restrictions =
smtpd_recipient_restrictions = reject_non_fqdn_sender,
reject_non_fqdn_recipient,                      permit_mynetworks,
permit_sasl_authenticated,                       reject_unauth_destination,
reject_unauth_pipelining,                       reject_non_fqdn_hostname,
reject_rbl_client relays.ordb.org,                      reject_rbl_client
dnsbl.njabl.org,                      warn_if_reject,
permit
smtpd_sasl_auth_enable = yes
smtpd_sasl_local_domain = $mydomain
smtpd_sender_restrictions =
hash:/etc/postfix/access,reject_unknown_sender_domain
smtpd_use_tls = no
strict_rfc821_envelopes = yes
transport_maps = hash:/etc/postfix/transport
unknown_local_recipient_reject_code = 450
virtual_alias_domains = hash:/etc/postfix/virtual_domains
virtual_alias_maps = hash:/etc/postfix/virtual


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