[postfix-es] Otro error 2 al pasar a la version 2 de postfix. SOS, no me llegan ciertos correos

[Dionisio Ruiz de Zarate]

HOla tengo otro eerro que antes no me daba con la version 1.
en los logs me parece:
reject: RCPT from unknown[IPCLIENTE]: 450 Client host rejected: cannot find
your hostname, [IPCLIENTE];
Donde IPCLIENTE es la ip del que me manda un correo

este error no me salia con el postfix 1 y es de direcciones email con las
que antes me "emaileaba" sin problemas.

me podeis ayudar?
gracias

la salida del postconf -n 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 =
disable_dns_lookups = no
inet_interfaces = all
mail_name =
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
maps_rbl_domains = relays.orbd.org, dnsbl.njabl.org
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
mydomain = dominio.org
myhostname = server.dominio.org
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
smtp_sasl_security_options = noanonymous
smtpd_client_restrictions = permit_sasl_authenticated,
smtpd_helo_required = yes
smtpd_helo_restrictions =
smtpd_recipient_restrictions = reject_non_fqdn_sender,
reject_non_fqdn_recipient, permit_mynetworks, permit_sasl_authenticated,
reject_u
nauth_destination, reject_unauth_pipelining, reject_invalid_hostname,
reject_non_fqdn_hostname, reject_rbl_client, warn_if_reject, reject
_unknown_client, permit
smtpd_sasl_auth_enable = yes
smtpd_sasl_local_domain = $mydomain
smtpd_sender_restrictions = hash:/etc/postfix/access
smtpd_use_tls = no
strict_rfc821_envelopes = yes
transport_maps = hash:/etc/postfix/transport
unknown_local_recipient_reject_code = 450



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