Email is a wonderful way to communicate and a fantastic business tool that allows nearly instantaneous delivery at near zero cost.
Unfortunately, anonymity and forgery have restricted the full potential of email to be a trusted method deliver a wide variety of information.
I have been working for 3 years to use verifiable message metadata cross referenced against a Library of Known Good Senders assists in 100% sure identification of Good Senders and of individual messages.
Read my whitepaper here:
Verisend: Restoring Confidence to Email with Verifiable Sender Identities