The current Internet email architecture is slowly dying. Garbage spam email is choking the system. The current ad-hoc, heuristic based spam filtering is a messy spam eater, eating 10-20% of good email while letting an equivalent amount of bad email get through.
While the current email architecture is based on the model of a cooperative university environment (both free and security lite), the next generation of email is being defined by GoodmailSystems to help businesses make sure their email makes it to the masses.
Basically, if a business sender meets certain minimum technical and business behavior standards, and pays a 1/4 cent per email fee, an unmistakable "certified email" graphic flag is displayed to the email recipient in a non-fakeable portion of the web page (or AOL client window) displaying the email.