Sender ID licence opened up
Microsoft frees up access to anti-spam framework.
Microsoft has put the specifications for the Sender ID and Sender Policy Framework (SPF) email
verification system under its 'Open Specification Promise' (OSP), allowing open-source and other projects to
integrate the framework without charge or hinderance.
The Sender ID system ties email addresses to IP addresses, in an attempt to prevent spammers and phishers from
spoofing sender details. The system is currently used by a variety of mail filtering systems, but under the new scheme
will be available to a broader range of developers and products.
Rather than being a fully open licence, the OSP is essentially a promise not to sue anyone for using the technology
covered. The OSP homepage, with a full list of technologies released under the system, is
here.
25 October 2006
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