[Postfix-es] Problema con correo rechazado

[Andres Alejandro Dobie]

Hola lista les escribo para ver si alguno se da cuenta de porque me
rechaza el correo que a continuacion les detallo. Y de paso para ver
si tengo bien la configuracion del Postfix porque no estoy muy seguro.
Aclaro que soy relativamente nuevo con el tema del postfix, recien
hace un par de meses lo tengo instalado.

/var/log/mail.info

 Jun  1 15:51:30 inter postfix/smtpd[25121]: NOQUEUE: reject: RCPT
from ecsmta.info.errepar.com[200.32.3.202]: 450 4.7.1
<ecsmta-2.info.errepar.com>: Helo command rejected: Host not found;
from=<errordeliver en info.errepar.com> to=<CONTADURIA en PROVEBPBA.COM.AR>
proto=ESMTP helo=<ecsmta-2.info.errepar.com>
Jun  1 15:51:30 inter postfix/smtpd[25121]: disconnect from
ecsmta.info.errepar.com[200.32.3.202]
Jun  1 15:51:30 inter postfix/smtpd[25001]: connect from
ecsmta.info.errepar.com[200.32.3.202]
Jun  1 15:51:30 inter postfix/smtpd[25001]: NOQUEUE: reject: RCPT from
ecsmta.info.errepar.com[200.32.3.202]: 450 4.7.1
<ecsmta-2.info.errepar.com>: Helo command rejected: Host not found;
from=<errordeliver en info.errepar.com>
to=<TABARESFELIPE en PROVEBPBA.COM.AR> proto=ESMTP
helo=<ecsmta-2.info.errepar.com>
Jun  1 15:51:30 inter postfix/smtpd[25001]: disconnect from
ecsmta.info.errepar.com[200.32.3.202]


Lo esta rechazando por desconocer el HOST ??? o les parece otra cosa ???

Salida del postconf -n

alias_maps = hash:/etc/aliases
biff = no
canonical_maps = hash:/etc/postfix/canonical
command_directory = /usr/sbin
config_directory = /etc/postfix
daemon_directory = /usr/lib/postfix
debug_peer_level = 2
default_destination_concurrency_limit = 20
defer_transports =
disable_dns_lookups = no
disable_mime_output_conversion = no
header_checks = regexp:/etc/postfix/header_checks
html_directory = /usr/share/doc/packages/postfix/html
inet_interfaces = all
inet_protocols = all
mail_spool_directory = /var/mail
mailbox_command =
mailbox_size_limit = 0
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 = $myhostname localhost.$mydomain localhost $mydomain
provebpba.com.ar
mydomain = provebpba.com.ar
myhostname = inter.provebpba.com.ar
mynetworks = 192.168.0.0/28, 127.0.0.0/8
mynetworks_style = subnet
myorigin = $mydomain
newaliases_path = /usr/bin/newaliases
readme_directory = /usr/share/doc/packages/postfix/README_FILES
relay_domains = $mynetworks, provebpba.com.ar, $mydestination
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 =
smtp_use_tls = no
smtpd_banner = $mydomain ESMTP $mail_name ($mail_version)
smtpd_client_restrictions = permit_mynetworks, reject_rbl_client
blackholes.mail-abuse.org, reject_rbl_client dialups.mail-abuse.org,
reject_rbl_client relays.mail-abuse.org, permit
smtpd_helo_required = yes
smtpd_helo_restrictions = check_helo_access hash:/etc/postfix/helo_hostnames.map
smtpd_recipient_restrictions = permit_mynetworks
reject_unauth_destination reject_invalid_hostname
reject_unknown_hostname reject_unknown_sender_domain permit
smtpd_sasl_auth_enable = no
smtpd_use_tls = no
strict_8bitmime = no
strict_rfc821_envelopes = no
transport_maps = hash:/etc/postfix/transport
unknown_local_recipient_reject_code = 550
virtual_alias_domains = hash:/etc/postfix/virtual
virtual_alias_maps = hash:/etc/postfix/virtual


El master.cf esta como viene original asi que no lo reproduzco.

Alguna idea de porque rechaza esos mails en particular ?