[Dovecot] After Upgrade to Dovecot 2.0.5 SSL problems

[derunfehlbare at freenet.de]

Hi,
 
 I've upgraded my Dovecot from 1.2 to 2.0.5. Everything is working fine on my Gentoo, also login with imaps and pop3s.
 
 But:
 
 I have in my config autocreate folders for new users. After creating a   new user (with PostfixAdmin) I see in my logfile with SSL enabled this:
 
imap-login: Warning: SSL alert: where=0x4004, ret=560: fatal unknown CA [127.0.0.1]
 
With SSL-disable, autocreation folders for new users is no problem.
 
 I've searched a fiew days for a solution, but I did not find anything.  Also dovecot-page what describes running SSL does not help me.
 
 Here are the relevant config-sniplets:
 
plugin {
  autocreate = Trash
  autocreate2 = Sent
  autocreate3 = Junk
  autocreate4 = Drafts
  autosubscribe = Trash
  autosubscribe2 = Sent
  autosubscribe3 = Junk
  autosubscribe4 = Drafts
}

service imap-login {
  inet_listener imap {
    address = *
    port = 143
  }
  inet_listener imaps {
    address = *
    port = 993
  }
}

ssl = yes
ssl = yes
ssl_cert =