ADSP
A 2009 DKIM extension, RFC 5617, that let a domain declare it signs all its mail; little used and moved to Historic status in 2013.
What it means
ADSP let a domain publish a record at _adsp._domainkey stating whether all its mail is signed (all or discardable) so receivers could treat unsigned mail from it as suspect. It checked the From address, an early attempt at what DMARC does.
It saw little adoption: it had no reporting, no handling of third-party senders, and no way to see the effect of a policy before enforcing it. The IETF approved moving RFC 5617 to Historic in November 2013, and DMARC took its place.
Old _adsp records are ignored by modern receivers and can be deleted.
Related terms
Sources
What this definition rests on. The wording is ours; the facts are theirs.
- RFC 5617: DomainKeys Identified Mail (DKIM) Author Domain Signing Practices (ADSP)rfc-editor.org
- IETF Datatracker: Moving RFC 5617 (ADSP) to Historicdatatracker.ietf.org
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