Microsoft Stretches E-Mail Authentication Patent Claims
Participants in the IETF's MARID working group say the patent application appears to cover technologies in the older SPF standard, which was developed by others prior to the date of the application and is already widely deployed.Microsofts efforts to jump on the SMTP authentication train have hit a new roadblock. The companys publication of a patent application has started a fresh controvery with the IETFs MARID working group, which is trying to formulate e-mail authentication standards. According to participants in the working group, the patent appears to cover technologies in the older SPF (Sender Policy Framework) standard, which was developed by others prior to the date of the patent application and is already widely deployed. At issue is authentication of the mail-from value from the SMTP envelope, described by the RFC 2821 standard. Most of the MARID (MTA Authorization Records in DNS) discussions centered around other mail addresses in the headers, described by RFC 2822.
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