postfix en local erreur host inconnu

Bonjour.
J'utlise postfix uniquement sur mon réseau familial (deux pc).
Le serveur est sur tux.domainelocal . Le n°2 est camille.domainelocal
Sur tux les user ecrivent à root (ou le contraire) et je reçois les messages
via kmail(sendmail)sans souci par contre pas moyen d'écrire à camille.
<rousseau@camille.domainelocal> (expanded from <rousseau@camille>): Host or
domain name not found. Name service error for name=camille.domainelocal
type=A: Host not found

mon /etc/hosts
# generated by drakhosts
127.0.0.1 localhost.localdomain localhost
192.168.0.2 tux.domainelocal tux
192.168.0.5 camille.domainelocal camille

[cavelier2@tux ~]$ cat /etc/postfix/main.cf
# Please be sure to read the /usr/share/doc/postfix-*/README.MDK file
# to learn about differences from stock postfix to Mandriva package.
# This file contains only the parameters changed from a default install
# see /etc/postfix/main.cf.dist for a commented, fuller version of this
file.

# These are changed by postfix install script
readme_directory = /usr/share/doc/postfix-2.3.8/README_FILES
html_directory = /usr/share/doc/postfix-2.3.8/html
sendmail_path = /usr/sbin/sendmail.postfix
setgid_group = postdrop
command_directory = /usr/sbin
manpage_directory = /usr/share/man
daemon_directory = /usr/lib/postfix
newaliases_path = /usr/bin/newaliases
mailq_path = /usr/bin/mailq
queue_directory = /var/spool/postfix
mail_owner = postfix
global_config_directory = /etc/postfix

# User configurable parameters

#inet_interfaces = localhost
mynetworks_style = subnet
#delay_warning_time = 4h
smtpd_banner = $myhostname ESMTP $mail_name ($mail_version) (Mandriva Linux)
unknown_local_recipient_reject_code = 450
smtp-filter_destination_concurrency_limit = 2
lmtp-filter_destination_concurrency_limit = 2
delay_warning_time = 2h
myhostname = tux.domainelocal
mydomain = domainelocal
myorigin = $myhostname
mydestination = $myhostname, localhost.$mydomain,$mydomain
mynetworks = 127.0.0.0/8 192.168.0.0/24
debug_peer_level = 1
alias_maps = hash:/etc/postfix/aliases
mail_spool_directory = /var/spool/mail
alias_database = hash:/etc/postfix/aliases
smtpd_helo_required = yes
disable_vrfy_command = yes
maximal_queue_lifetime = 5d
message_size_limit = 10240000

Merci.
--
cordialement jean-jacques.
Ce message a été écrit sur un système libre mandriva
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Woody Allen.