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Messages can be scheduled for a specific future time. Scheduled messages appear in the Outbox with a scheduled status until delivery.

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Scheduling a message

Add a scheduled_at field in ISO 8601 format: 
{
  "to": "user@example.com",
  "subject": "Your trial ends tomorrow",
  "scheduled_at": "2026-04-01T09:00:00Z"
}

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Canceling a scheduled message

Scheduled messages can be canceled before delivery via the dashboard or API as long as their status remains scheduled.