Here are the hidden costs of the spam in your company:

Waste of productivity
By sorting spam, each employee wastes annually: (calculation base: about 5 seconds per spam)
Moreover we take into account the risk of temptation which is annually estimed to: (calculation base: 20-minutes waste of time for 1 spam in 1000)
GLOBAL waste of time per employee
This involves a hidden cost which is estimated to:
Computing cost
Spam transmission and storage involve a cost per employee which is estimated to: (calculation base: 0.01 € per spam)
This involves an additional cost which is estimated to:
SPAM COSTS IN YOUR COMPANY