I rephrase :)
I want to remove the spam of my old mboxes (which I had before using
dspam). I have many old mboxes since I keep all my mails.
I see!
I think there's no way to do it without touching the db, unless you use
--classify, but then (I think) you can't use --deliver=quarantine.
You'll have to either manually or with some scripting, pick out the
emails from the mbox.
Might be easier to merge user ricou to another temporary user and using
that temporary user to quarantine the spam mails, then remove the temp
user history & tokens, etc, etc.
-Troy