[postfix-es] Otro problema con el postfix 2. SOS... me estoy volviendo loco

[Dionisio Ruiz de Zarate]

Me esta matando el postfix 2., con la version 1 ni con los sendmails que
configure ( y de los cuales me pase a postfix) no me paso esto.

esta es otra.
mando algunos emails y recibo notificacion que no se envian con un error muy
raro.
el erro es:
host
[XXX.XXX.XXX.XXX] said: 550-Envelope sender verification
    failed 550 rejected: cannot route to envelope sender: Response from
    mal.servidor.com [XXX.XXX.XXX.XXX] was "550 <postmaster en tinieblas.com>:
User
    unknown" when checking for existence of a postmaster mailbox. RFC 822
    section 6.3 (which you have to abide by if you send and receive Email)
    states that you are required to have a postmaster mailbox that is routed
to
    the person responsible for mail (http://www.rfc822.com/).  We need to be
    able to contact you at the postmaster address to resolve potential
problems
    if need be before we can accept your mail. Please create a postmaster
    account at your site <dionisio en tinieblas.com> (in reply to MAIL FROM
    command)


Me podeis ayudar?
mi salida del postconf -n es ( por si os sugiere algo o si me podeis ayudar
a configurarlo mejor):
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 = yes
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
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
mydomain = dominio.com
myhostname = server.dominio.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 = $mydomain
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_banner = ESMTP SENDMAIL (8.11.10)
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_unauth_destination, reject_unauth_pipelining,
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
virtual_alias_domains = hash:/etc/postfix/virtual_domains
virtual_alias_maps = hash:/etc/postfix/virtual


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