NRR
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AS2's legal guarantee, distinct from a plain transport acknowledgement.
Definition
NRR is not a message but a state of proof: it requires a signed original message, a signed MDN, and the sender verifying that the returned Message-ID and MIC match those it retained. It is best established when both sides use digital signatures; retaining the content, security basis, and digest value is required.
Origin
Defined in sections 1.2, 2.3.2 and 9.1 of RFC 4130 (IETF, 2009).
Example in context
Signed MDN received → Received-Content-MIC == recorded MIC of original message → NRR established.
Related terms
- Received-Content-MIC — the proof compared to establish NRR.
- MDN — the signed receipt it rests on.