History
For some time ADSP was known as ASP (Author Signing Practices), or the original SSP (Sender Signing Practices) considered misleading, until a protocol naming poll.
Domainkeys, DKIM's predecessor, had an Outbound Signing policy consisting of a single character, "-" if a domain signs all email, and "~" otherwise. DKIM specification intentionally avoided signers' policies considerations, so that DKIM does not validate a message's "From" field directly, but is a policy-neutral authentication protocol. The association between the signer and the right to use "From", a field visible to end users, was deferred to a separate specification. The draft ADSP specification started in June 2007 and went through 11 revisions and uncountable discussions before being published as RFC in August 2009.
Eric Allman, the author of Sendmail, was an editor of the ADSP specification for the IETF DKIM Working Group.
Read more about this topic: Author Domain Signing Practices
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