Best Practices in Spam Control The Problem Is Big and Getting Bigger Meta Group estimates at least 40% of email that reaches the enterprise is Spam Major email providers like AOL, MSN, EarthLink and Yahoo block up to 70% of the spam before it reaches the enterprise
Quarterly from March 2002 to June 2003, the peak number of daily spam emails detected and blocked by America Online.
It’s a dimension more difficult than anti-virus which is essentially a binary decision (is it a virus or not). Spam is more like triage, while there are some emails that are clearly spam and some that are clearly not spam, many are not so clearly black or white but gray. Spam can be categorized in four ways:
Confidence games, pornography and unethical senders
Chain letter, hoaxes and urban legends
Legitimate offers from legitimate senders
“Occupational spam” from your colleagues and business associates
The job at the boundary is to separate the “good guys” (3 & 4), who should be using ethical practices that will allow you to unsubscribe, from the “bad guys” (1 & 2) who should be blocked.