Ok, sorry.
My mail server is in production for about a dozen of persons, so I can't play a lot with it. Each time I test something, immediatly after I put it in the right away.
So, now, forwading is disabled and not working. I am using a virtual domain 'epigenomique.genopole.fr', I have enabled it in Server Admin and I have localhost in aliases (in Server Admin).
This is the result of postconf -n :
command_directory = /usr/sbin
config_directory = /etc/postfix
content_filter = smtp-amavis:[127.0.0.1]:10024
daemon_directory = /usr/libexec/postfix
debug
peerlevel = 2
enable
serveroptions = yes
html_directory = no
inet_interfaces = all
mail_owner = _postfix
mailbox
sizelimit = 0
mailbox_transport = cyrus
mailq_path = /usr/bin/mailq
manpage_directory = /usr/share/man
maps
rbldomains =
message
sizelimit = 10485760
mydestination = $myhostname,localhost.$mydomain,localhost
mydomain = epigenomique.genopole.fr
mydomain_fallback = localhost
myhostname = ns.epigenomique.genopole.fr
mynetworks = 127.0.0.0/8,193.51.128.144/29,192.168.0.0/24,193.51.128.129/32
newaliases_path = /usr/bin/newaliases
queue_directory = /private/var/spool/postfix
readme_directory = /usr/share/doc/postfix
sample_directory = /usr/share/doc/postfix/examples
sendmail_path = /usr/sbin/sendmail
setgid_group = _postdrop
smtpd
enforcetls = no
smtpd
pw_server_securityoptions = cram-md5
smtpd
recipientrestrictions = permit
sasl_authenticated,permit_mynetworks,reject_unauthdestination,permit
smtpd
sasl_authenable = yes
smtpd
tls_certfile = /etc/certificates/ns.epigenomique.genopole.fr.crt
smtpd
tls_keyfile = /etc/certificates/ns.epigenomique.genopole.fr.key
smtpd
tlsloglevel = 0
smtpd
use_pwserver = yes
smtpd
usetls = yes
unknown
local_recipient_rejectcode = 550
virtual
mailboxdomains = hash:/etc/postfix/virtual_domains
virtual_transport = lmtp:unix:/var/imap/socket/lmtp
Thanks a lot,
joe