over quota

In virtualmin 5 using sendmail as the mta, when a user went over quota, their mail would stay in the mailq for a few days sending replies to senders that the user was over quota. When an admin raised their quota or they emptied their mail folders, sendmail unspooled their email. That made for a nice trip wire of sorts. Now in VM 6 with postfix, the messages just bounce. Any chance of getting VM6 to just spool that mail up again??