--if not more than that, mainly because of the industry, almost, that came up to prevent spam. People have heavily invested in it, and the services are not cheap. The price for some of these services is somewhere in the area of $50 a month per mailbox. If you times that by 10,000 employees, that's a pretty hefty anti-spam bill you're fighting annually.
Those types of services and costs are based not only on what it costs to prevent spam but also on what it costs in employee time. We had briefly touched on that earlier with one of your colleagues. It would cost easily $300 a year per employee for just the time it takes to hit the delete button or to move it to a junk folder. That's significant time that you're breaking someone's work flow.