[Dovecot] Dovecot to call sa-learn?

Hello,

We offer our users to learn spam/ham by using folders called 'learnham' or 'learnspam'. We currently use a cron job and use find to search through all the folders to find folders called learn-spam and then call sa-learn etc to process each message.

Is there away that dovecot can call a script when a message is moved to a particular folder? It seems to me that this would be more efficient than using find, and would get the messages learnt as soon as they are moved in to the learning folders.

Andrew.