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Sender ID is an E-Mail Authentication proposal that builds upon SPF. It's an attempt to validate not only the RFC5321.MailFrom domain, but also the RFC5322.From domain and other headers.

Sender ID was created by the IETF MARID working group and partly patented by Microsoft. Sender ID is defined in RFC 4406 with additional parts in RFC 4405, RFC RFC 4407 and RFC RFC 4408.

Due to standardization and licensing issues, SenderID was deprecated before it even came out of the experimental stage.

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