Firstly, their spam settings page: http://img34.imageshack.us/img34/3830/clipboard01ba.png
As I understand it, incoming mail is given a spam score, the higher the score, the more likely it is spam. This appears to be backed up by the line saying the higher you set the spam threshold, the more "spam-like" the message has to be to get flagged/deleted (i.e. the spam filter will be weaker).
But here's the problem. By default, emails are deleted when they reach a spam threshold of 4 and above, and they are flagged when they reach a threshold of 5 and above. Under these settings, spam will always be deleted before it is flagged, which defeats the whole point of having two thresholds. Not only that, but the system will refuse to allow you to even set the spam threshold for flagging below that of deleting.
It makes me wonder if the person who set this up got completely confused, which is worrying as having spam filters set too high results in false positives and lost mail.
Any thoughts on this?