Email sync is harder than it looks. Learn approaches to syncing email reliably, handling duplicates, incremental updates, and thread state changes.
Email sync architecture is how an email product reliably mirrors messages, threads, and state changes from providers like Gmail and Outlook. The challenge is incremental change, not the first sync.
A solid approach includes incremental sync checkpoints, deduplication by provider IDs, and careful handling of message state (read/unread, labels, moves). Threading adds complexity because one action can affect multiple messages.
Reliability comes from idempotent processing, retry logic, and good logging. Gmailo should treat sync as a core competency because users expect zero missing messages and accurate thread state.