AT & T got a patent (6.643.686) on tricking Anti-Spam-Tools. I'm not sure if it's good or bad ... http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/srchnum.htm&r=1&f=G&l=50&s1=6,643,686.WKU.&OS=PN/6,643,686&RS=PN/6,643,686 cu cbf