[Dovecot] sdbox-format and sa-learn(spamassassin)

[Ingo Thierack]

Hello,

is it somehow possible to use sa-learn on sdbox-mailboxes?
Maybe i can use dsync to "mirror" the mailboxes(only the spam-subfolder) 
to another
location and convert it to mbox or maildir and act then on it with sa-learn?

I know the antispam-Plugin, but until now no success, to get it running. 
So I think about
an way, to learn via sa-learn on an file which i can process.

Regards
Ingo