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Event triggered whenever the email failed to send due to an error. This event is triggered when there are issues such as invalid recipients, API key problems, domain verification issues, email quota limits, or other sending failures. 
{
  "type": "email.failed",
  "created_at": "2026-11-22T23:41:12.126Z",
  "data": {
    "broadcast_id": "8b146471-e88e-4322-86af-016cd36fd216",
    "created_at": "2026-11-22T23:41:11.894719+00:00",
    "email_id": "56761188-7520-42d8-8898-ff6fc54ce618",
    "from": "Acme <onboarding@resend.dev>",
    "to": ["delivered@resend.dev"],
    "subject": "Sending this example",
    "template_id": "43f68331-0622-4e15-8202-246a0388854b",
    "failed": {
      "reason": "reached_daily_quota"
    },
    "tags": {
      "category": "confirm_email"
    }
  }
}