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Bulwark had no read-receipt support (JMAP/Stalwart have no native MDN). End-to-end, client-side, in three parts: - Request (compose): a toolbar toggle (MailCheck, green when on) sets Disposition-Notification-To on the outgoing message via the JMAP "header:<name>:asText" create property. Threaded composer -> page -> email-store -> client.sendEmail. Default from requestReadReceiptDefault. - Detect (viewer): reads Disposition-Notification-To case-insensitively from the parsed headers and shows a banner (green Send / red Ignore) in the unified notification bar. Hidden in Sent/Drafts/Trash/Junk and once handled. message/disposition-notification + message/delivery-status report parts are filtered out of the attachment list. - Respond (MDN): lib/mdn.ts builds an RFC 8098 multipart/report (text/plain + message/disposition-notification, UTF-8/base64, localized subject + body). client.sendReadReceipt uploads the blob, imports it into Sent via Email/import, then submits with an explicit envelope. Both Send and Ignore set the $MDNSent keyword (RFC 3503) so no client re-prompts. Behaviour configurable: ask / always / never. New: lib/mdn.ts, read-receipt-banner.tsx. Settings (requestReadReceiptDefault, readReceiptResponse) + UI. All 17 locales.