feat(changelog): transactional-email-changed-webhook-event-update-to-ema 2024-11-05 (scaleway#3947)

Author: ofranc

changelog/november2024/2024-11-05-transactional-email-changed-webhook-event-update-to-ema.mdx

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+---
+title: Webhook event - update to email error field
+status: changed
+author:
+    fullname: 'Join the #transactional-email channel on Slack.'
+    url: 'https://slack.scaleway.com'
+date: 2024-11-05
+category: managed-services
+product: transactional-email
+---
+
+The `email_error` field has been replaced by two new fields: `response_code` and `response_message`. This change allows for more precise error identification and improved tracking of response details. See the [documentation](/managed-services/transactional-email/api-cli/webhook-events-payloads/) for full details.
+