Courier-IMAP & LDAP

[Skrelpawin]

Hi everybody,

i wanted to set up a mailserver with vhosts with a ldap as DB. Most of my setup seems to be quite right.
My Postfix delivers the mail into the /home/vmail/domains/<DOMAIN>/<USER> dir.
I can see them when i use "Read User Email" from Webmin.
But when i trie to use Thunderbird, Outook Express, etc. something quite mythteric happens

My email-client connects, authenticates and checks the account (Outlook Express shorty shows a blue 2 in blue brackets behind the account/Thunderbird says INBOX: 2 of 2 Headlines) but i get no mail!!!
I have tested some other things:
I can create Folders!
I can move Mails from other Accounts in the INBOX/Trash/Sent-Folder
I can delete moved mails
I can delete Folders
I have a copy of sented emails in my sent-Folder

The Logfiles do not show anything like:
Permission denied, XXX not found or else.

Hoping anyone has an answer and post it

Greetings,
Skrelpawin