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Auth & scopes
  • 401 Invalid API key → Check Authorization: Bearer header or x-api-key
  • 403 Missing scope → Ensure key has send_email/read_sends/preferences_* as needed
Limits & idempotency
  • 429 Rate limit → Wait Retry-After seconds; retry with same Idempotency-Key
Tenant & identity
  • 403 Tenant paused → Resume in dashboard or contact admin
  • No active identity → Set From domain + DKIM in Deliverability
Delivery signals
  • No delivered events → Events are managed automatically; verify the send timeline and contact support with sendId if missing
  • Bounces/complaints → Address reputation; suppressions are applied automatically
Preferences
  • Unsubscribe doesn’t reflect → Use token in /api/unsubscribe or update via /api/v1/preferences
Still stuck?
Email support@fluxomail.com with your sendId and timestamp.