Redmine

Hi

I try since a few hours to configure my Redmine 1.1.1 running on a CentOS 5.5 Server with Ruby 1.8.6 to accept anonymous mails and create a user and a new ticket. For registered users the mail function works, but don't for anonymous users.
Can u help me with this issue?
I tried this code:

rake -f /where/my/redmine/is/Rakefile redmine:email:receive_imap RAILS_ENV="production" host=my.mailhost.ch username=user@mailhost.ch password=apassword project=aproject tracker=support allow_override=tracker,priority unknown_user=create no_permission_check=1 --trace

For sure i have filled in correct values by the mail parameters.
The trace gives me nothing special:

** Invoke redmine:email:receive_imap (first_time)
** Invoke environment (first_time)
** Execute environment
** Execute redmine:email:receive_imap

The log of Redmine has no entry.

The mail has gone be read but not deleted in the IMAP Mailbox.

In the configuration panel i have disabled the "Login needed" option.

Anyone?

Thanks!

Chris