We just have installed our Fortimail and all is doing well. But because the amount of spam I don't want to check this by myself, but let the recipient doing this job. By now I managed that spam is going to the users quarantine box and that this is cleaned up for non existing users. I already enabled "allow quarantined email access through webmail" although I don't know if this has to be.
I could access this sending a quarantine mail but that is not what I want, I just need access to this user/personal quarantinebox