Email queue
Invitation, reset, lesson and invoice emails can be queued and retried rather than blocking user requests.
Operations
Notifications should be queued, traceable and retryable.
The platform separates business events from message delivery so temporary mail or provider failures do not silently lose important operational communication.
Lesson reminders
Scheduled jobs can create reminder events from authoritative upcoming lesson records.
Payment notices
Failed, pending or reconciled payment states can trigger controlled communication.
Integration retries
Calendar, video and webhook jobs use attempts, next-run time and dead-letter handling.
Preferences
Operationally necessary messages are separated from optional marketing preferences.
Delivery audit
Provider reference, attempt count and final delivery state remain observable.