As you can see, there are as many ways to fight spam as there are budget requirements, IT staff, and philosophies. Combining both spam and virus-fighting at the server end easily doubles your ROI thanks to not only all the time your users lose combing through the spam rot in their email box, but also by saving you from having to come in and clean up the mess of a network drowning in virus and worm traffic.
This four-part series still only touches the tip of the spam iceberg. If this subject strikes your fancy, there are many places to turn for further information. Here are some of our favorite sites: