Can I edit amavisd.conf manually to set spam filter to put to a spam folder to each user? how? I ask that because I am not sure ispconfig3 will control user's mail folder or not. As I asked something edit manually and it's not allow. Thanks.
As far as I know, amavisd does not support to store the spam emails for every user into their local spam maildirs. The amavisd quarantining feature works differently and is not capable of using the imap accessible maildirs of a email user.