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A draft's attachments and inline images are MIME parts of that draft, and their blobIds die with the version that holds them. Each save creates the next version and then destroys the previous one (#849), but the composer kept sending the blobIds it was seeded with. The first save worked, every later save failed with "blobId ... does not exist on this server", and so did the send. This is the second half of webmail #849, which the webmail fixed in 5d2b937a but which was never ported here. - saveDraftVersion() reads the new version's attachment parts back in the same request (Email/get on the creation id "#draft"; Stalwart 0.16 does not resolve a result reference into Email/set "created"). createDraft() keeps its signature on top of it. - The composer maps each held blobId to the matching part of the latest version (inline by Content-ID, the rest by name and size) and sends that. Uploads are re-pointed too, since an unreferenced upload expires. The map lives in a ref, so the dirty snapshot does not change on every save. - Opening a draft with inline images no longer looks like an edit. The hydration swapped the editor body for its normalised DOM HTML but compared it with the raw server HTML, so the autosave replaced the draft about two seconds after it opened. That destroyed the opened version, and a plain "open, then Send" failed with the same blobNotFound. Tests: unit tests for the matching and rebasing, a fake-server test that reproduces the failure without the rebase, and an opt-in live Stalwart test (verified against Stalwart 0.16.22). Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>