Mails will not be appended to user's mailbox

Dear all,

we just got in trouble with our Mailserver (XServe MOSXS 10.4.2) while sending internal Email.

We receive emails from external (using fetchmail, cause our mailserver is no offical) and we can send emails to accounts outside of our mailserver. This works fine.

Our Mailserver ist mailserver for two domains ("carbon-logistics.de", "carbon-consulting.net"), but i think the behaviour will be the same with only one domain.

When i send e.g. from Frank.Knobloch@carbon-logistics.de to Frank.Knobloch@carbon-logistics.de the following output can be seen in mail.log:

Sep 5 12:24:42 sv000014 postfix/smtpd[27069]: connect from ws000001.carbon-consulting.net[192.168.1.7]
Sep 5 12:24:43 sv000014 postfix/smtpd[27069]: 1140349D24: client=ws000001.carbon-consulting.net[192.168.1.7], sasl_method=LOGIN, sasl username=frankknobloch
Sep 5 12:24:43 sv000014 postfix/cleanup[27072]: 1140349D24: message-id=<B458761C-5FAA-448F-93A8-871A5FDA2B39@carbon-logistics.de>
Sep 5 12:24:43 sv000014 postfix/qmgr[26239]: 1140349D24: from=<Frank.Knobloch@carbon-logistics.de>, size=611, nrcpt=1 (queue active)
Sep 5 12:24:43 sv000014 postfix/smtp[27124]: 1140349D24: to=<Frank.Knobloch@carbon-logistics.de>, relay=none, delay=0, status=bounced (mail for carbon-logistics.de loops back to myself)
Sep 5 12:24:43 sv000014 postfix/cleanup[27072]: 21D3649D27: message-id=<20050905102443.21D3649D27@mail.carbon-consulting.net>
Sep 5 12:24:43 sv000014 postfix/qmgr[26239]: 21D3649D27: from=, size=2469, nrcpt=1 (queue active)
Sep 5 12:24:43 sv000014 postfix/qmgr[26239]: 1140349D24: removed
Sep 5 12:24:43 sv000014 postfix/smtp[27124]: 21D3649D27: to=<Frank.Knobloch@carbon-logistics.de>, relay=none, delay=0, status=bounced (mail for carbon-logistics.de loops back to myself)
Sep 5 12:24:43 sv000014 postfix/qmgr[26239]: 21D3649D27: removed

But the mail is not appended to my INBOX.
When i choose another recepient the same thing happens.

The user-dirs are all like "frank_knobloch" but sending to frank_knobloch@carbon-logistics.de will produce the same behaviour.

When i send to fk (another alias and without appending the domain it seems to work)

Here ist the config.

sv000014:~ admin$ postconfig -n
-bash: postconfig: command not found
sv000014:~ admin$ postconf -n
command_directory = /usr/sbin
config_directory = /etc/postfix
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
mydestination = $myhostname,localhost.$mydomain,localhost,mail.carbon-logistics.de,mail.carbon- consulting.net
mydomain = carbon-consulting.net
mydomain_fallback = localhost
myhostname = mail.carbon-consulting.net
mynetworks = 127.0.0.1/32,192.168.1.1/24,213.252.152.229/32
mynetworks_style = host
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 pw_server_securityoptions = gssapi,cram-md5,login
smtpd recipientrestrictions = permit sasl_authenticated,permit_mynetworks,reject_unauthdestination,permit
smtpd sasl_authenable = yes
smtpd tls_keyfile =
smtpd use_pwserver = yes
unknown local_recipient_rejectcode = 550

Any hints?

Thanks

Frank