Add Remote Image Archiving (parked idea) page Records the idea of downloading remote https:// email images at import for privacy/archival/offline, and — prominently — the SSRF danger that keeps it parked (may never ship). Cross-linked from the Email Rendering & Images page.
Add Email Rendering & Images technical deep-dive page New developer-facing page covering how inbound email is rendered: inline (cid) vs remote (https) images, the get_attachment.php serving pipeline, the BASE_URL sub-path 404 bug (#777), and the two CSS-isolation fixes — the scoped box-sizing content-box reset (#778) and full Shadow DOM isolation (#779), including why iframe was rejected. Linked from the sidebar under Tickets.