TEOS, the Trusted Email Open Standard: "On April 30, 2003, an organization known as ePrivacy Group, of which Stephen Cobb was a co-founder, announced the Trusted Email Open Standard (TEOS) as a way to fight spam, message spoofing, and email fraud"
https://books.google.com/books?id=Ykf6-nhW_CwC&pg=PA65&lpg=PA65&dq=teos+trusted+email+open+standard&source=bl&ots=ApQGsp604W&sig=gW6SJ7OyOJBag9oJGG7oPirqvas&hl=en&sa=X&ei=QuKqVK6wMse3oQSAq4L4Dg&ved=0CFAQ6AEwCg#v=onepage&q=teos%20trusted%20email%20open%20standard&f=false
'via Blog this'