I'm running my own postfix mail-server at home with a setup similar to this one. I opted to deliver tagged spam via dovecot to the user's spam-mailbox, so that they can review tagged emails if they wish to; these spam-mailboxes get purged regularly and SA's bayes is trained on them.
The thing that's annoying though is that SA (or amavisd-new, I'm not even sure on that) additionally saves the tagged spam to /var/virusmails/spam-xxx.gz, which I don't want. I cannot find the correct option in the configuration to turn that behavior off.
Any pointers well appreciated.