Hi Folks, As part of the "Exchange Edge Services" and "Coordinated Spam Reduction Initiative (CSRI)", Microsoft is moving aggressively to implement the "Caller ID for e-mail". Caller ID for e-mail specification is part of the broader CSRI initiative ( which is a Microsoft Policy & Technology proposal), and is intended to prevent domain spoofing in an effort to combat spam. Both "Exchange Edge Services" and "Coordinated Spam Reduction Initiative (CSRI)" were announced by Bill Gates in Feb., 2004 at the RSA conference. These technology proposals are widely expected to become Industry Standards in the very near future. So if you are not in the know, it's about team to get familiar with these upcoming technologies, as we will definitely see customer mail flow issues, and CritSits surrounding these technologies. As mentioned in the excerpt below, Microsoft is aggressively working with its industry partners on the pilot, so it's very close from being a reality. http://www.microsoft.com/presspass/press/2004/feb04/02-24RSAAntiSpamTech VisionPR.asp "Microsoft is moving ahead with plans for a pilot implementation of Caller ID for E-Mail in its Hotmail(r) service. Hotmail will begin publishing outbound IP addresses today and will begin checking inbound addresses early this summer. In addition, the company continues to work with others in the industry to test this proposal, including Amazon.com Inc., Brightmail Inc. and Sendmail Inc." If you want to know more about Edge Services, CSRI, & Caller ID for e-mail please see the following links: ( Draft proposals for both Caller ID for E-mail and CSRI are available at the links below) Coordinated Spam Reduction Initiative: http://www.microsoft.com/mscorp/twc/privacy/spam_csri.mspx Caller ID for E-Mail Technical Specification: http://www.microsoft.com/mscorp/twc/privacy/spam_callerid.mspx E-Mail Protection With Exchange Edge Services: http://www.microsoft.com/presspass/press/2004/feb04/02-24ExchangeEdgeSer vicesPR.asp The following three PDF docs are also available at the Caller ID for e-mail link above: "Caller ID for E-Mail: The Next Step to Deterring Spam" Initial specification to address domain spoofing. "Protecting Domain Names from Spoofing: A Guide for E-Mail Senders" Instructions and templates for protecting a domain name from spoofing using the Caller ID specification. "Caller ID for E-Mail Implementation License" The terms of the patent license for implementing this specification. Regards, Seyi