In early 2004, the IETF created the MARID working group and tried to use SPF and Microsoft's CallerID proposal as the basis for what is now known as Sender ID but this collapsed due to technical and licensing conflicts. Originally SPF stood for Sender Permitted From and was sometimes also called SMTP+SPF but its name was changed to Sender Policy Framework in February 2004. Over the next six months, a large number of changes were made and a large community had started working on SPF. In June 2003, Meng Weng Wong merged the RMX and DMP specifications and solicited suggestions from others. Among the proposals submitted to the ASRG were "Reverse MX" (RMX) by Hadmut Danisch, and "Designated Mailer Protocol" (DMP) by Gordon Fecyk. These posts ignited a lot of interest, led to the forming of the IETF Anti-Spam Research Group (ASRG) and their mailing list, where the SPF idea was further developed. The very next day, Paul Vixie posted his own SPF-like specification on the same list. No mention was made of the concept again until a first attempt at an SPF-like specification was published in 2002 on the IETF "namedroppers" mailing list by Dana Valerie Reese, who was unaware of the 2000 mention of the idea. ![]() The first public mention of the concept was in 2000 but went mostly unnoticed.
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