Dspam not working like expected anymore

Hello,

it seems that my dspam does not work like expected any more. It did once, but  
now, for a long time nothing has been automatically marked as spam, even if 
the spam emails are very similar to what I have defined as spam by moving 
emails to my Spam folder.

About my configuration: I use dovecot as IMAP daemon and there is an antispam 
plugin available for dovecot. I configured that plugin so that emails are saved 
in ${MAILUSER_HOME}/spam/${UNIQUE_FILENAME} when moving  them to an IMAP 
folder called "Spam" and that emails are saved in 
${MAILUSER_HOME}/ham/${UNIQUE_FILENAME} when moving them away from the Spam 
folder. From time to time, a cron job calls a script /usr/local/sbin/dspam-
retrain which processes the files in the ham and spam subdirectories of every 
mail user.

The attached file contains my dovecot configuration files from /etc/dspam, a file 
/etc/default/dspam which sets some dspam options and the dspam-retrain script. 
As already mentioned, there was a time when my dspam recognized and marked 
spam emails. I do not remember if I changed any of my configuration files since 
then.

My dspam version is 3.10.1

Regards
  Christoph

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