Sorry I don't know any Germany.
I notice a problem with IMAP feature. That is, spami will purge the folder when it log in to the IMAP server. However, if user set up automatic download (synchronise) email every X minutes and leave the machine unattended, he have no chance to examine the recycle bin (or learning area). Hence, some legitimate emails which are identified as spams will be purged without any chance to recover.
Just wondering if it is possible to just mark the spam as 'deleted' without execute the 'purge' command during the next log in. In this case, user can still retrieve those false-positive emails.
Thanks