"The two Silicon Valley companies announced support of DomainKeys, a proposed system for verifying the identity of an e-mail sender and reducing e-mail forgeries," reports CNet.
"In a separate announcement, Sendmail said Tuesday that it will back Microsoft's system for identifying the origin of e-mail, an initiative called "caller ID for e-mail" that aims to cut down on fraud. Sendmail will develop software tools for Microsoft's program as plug-ins for its open-source and commercial software."