Author Domain Signing Practises

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In computing Author Domain Signing Practises (ADSP) is an optional part of the E-mail authentication scheme DKIM, formerly DomainKeys. Some ADSP details are still under discussion in the IETF working group DKIM.

[edit] Concepts

With ADSP domain owners can publish that all mails From their domain have a corresponding DKIM signature as defined in RFC 4871. The variant formerly known as a strong signing practise could state that other mails claiming to be From authors in the ADSP domain are discardable.

Here From refers to the RFC 2822 e-mail header field From. The domains in 2822-From addresses are not necessarily the same as in the more elaborated Purported Responsible Address covered by Sender ID specified in RFC 4407.

The domain in a 2822-From address is also not necessarily the same as in the envelope sender address defined in RFC 2821, also known as SMTP MAIL FROM, envelope-From, 2821-From, or Return-Path, optionally protected by SPF specified in RFC 4408.

[edit] History

For some time ADSP was known as ASP Author Signing Practises, SSP Sender Signing Practises, and SSP Sender Signing Policy. It was never a part of SPF.

Eric Allman, the author of Sendmail, was the editor of the ADSP memo for the IETF DKIM Working Group.

[edit] External links

• IETF DKIM page with the current ADSP draft