[Dovecot] Filtering virtual mailbox using other virtual mailbox?

Hi All, my name is Giovanni and I am new to dovecot. I have installed version 2.0 the past week and I find it very powerful. I have started to play with the virtual mailbox plugin. I was unable to do a virtual mailbox filtering out the contents of
other mailbox, for instance

I have a virtual/spam mailbox which filter out all the spam thanks to
spamassassin. This mailbox is virtual, its description is INBOX -Trash -Trash/* -Junk subject SPAM

I'd like to do a simple virtual/ham mbox using this dovecot-virtual

INBOX -virtual/spam to: jj@gioorgi.com

but it seems not working. it does not filter the spam.

It is possible to do such thing, or I am trying to do something not
possible at all? Thank you

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Giovanni Giorgi jj@gioorgi.com