Inline images (referenced by src="cid:…") are now classified at ingest and kept out of the downloadable attachment lists, RSS/Atom enclosures, and the API — while still stored in R2 and cleaned up with the email. Fixes the admin email preview, which injected raw HTML into the data: iframe so cid refs never resolved; it now rewrites them to absolute /files URLs. Co-Authored-By: Claude Opus 4.7 <[email protected]>