Sometimes a few (spam-) messages slip through. How come?
This is not a bug in Mailfilter. Consider this a feature of every POP e-mail server. Once you start checking for spam or downloading messages, the server locks your mail box. If new messages arrive during the locked state, they will be queued and provided for further processing after the lock has been removed. So Mailfilter does not see incoming messages while it checks for spam and sometimes it happens that a message or two arrive just in time to be too late for filtering, but in time for download. That’s life.
