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POST
we sent earlier (AS2 async mode). We match it to the tracked delivery by Original-Message-ID, verify the disposition and — recomputing the MIC from the delivery’s stored payload — the integrity check, then flip the delivery to delivered (or failed with the partner’s reason). Unauthenticated by AS2 design; the match is to a Message-ID we minted, and a signed MDN must verify against the partner’s configured certificate before it can change delivery state.

Response

No response body. MDN processed (matched or ignored).

Status codes

Last modified on August 31, 2026