Isocentric Networks knows that email is the primary tool for communications among companies worldwide.  With alarming increases in virus attacks and spam, email is much less efficient than it used to be.  Isocentric's answer is SPAMACUS. 

SPAMACUS is an integrated hardware and software solution that completely eliminates spam and protects your email from all forms of attack.  Email may be blocked, quarantined, tagged, or delivered based on the policies of your organization or the preferences of an individual user.