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* [SMTP] Add reliable email delivery with retry and database-backed queue Rework the SMTP client from fire-and-forget sending into a persistent queue with exponential backoff and per-message retry budget, backed by the existing database rows as the durable source of truth. - Keep pending emails in an in-memory queue with attempts/backoff tracking; enqueue without deleting database rows, and only remove the row once delivery is confirmed via the mailDelivered signal. - Add exponential backoff (doubling, capped at 30 min) between delivery attempts, bounded by new smtp/maxretries and smtp/retrydelay settings. - Track connection-layer failures (connect/auth/encrypt) with their own backoff; route failures to recordFailed/recordConnectionFailure so undeliverable mail eventually drops from the queue instead of retrying forever. - Treat rejected recipients/senders as permanent failures. - Rebuild the SMTP buffer from the authoritative queue before each send via a new QxtSmtp::reset() so reconnects never duplicate deliveries. - Start the idle timeout after authentication, not on TCP connect, so slow SSL/STARTTLS handshakes are not cut short. * [SMTP] Fix retry accounting, backoff reset, and token dedupe --------- Co-authored-by: Lukas Brübach <Bruebach.Lukas@bdosecurity.de> |
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