The Internet Engineering Task Force (IETF) has adopted a new anti-spam technology called DomainKeys Identified Mail which, if implemented by email providers, promises to block all fake and fraudulent email messages.
The proposed standard, DomainKeys Identified Mail (DKIM) Signatures, is available from the RFC Editor database. RFC Editor is a repository of technical and organizational documents about the Internet, including the technical specifications and policy documents produced by the IETF. For more coverage, see the CNET News.com article: Promising antispam technique gets nod.