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Miscellaneous

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A list of all the available custom headers

  • seseu-track-clicks
  • seseu-track-opens
  • seseu-data-retention
  • seseu-metadata-retention
  • seseu-to
  • seseu-sandbox
  • seseu-sandbox-result

556 Invalid account. Tenant or Domain not found for 'placeholder'.

Most likely the domain name that you are trying to send e-mail from was not added or configured correctly. Make sure to add the domain and configure DNS completely before sending e-mail. Resolve any DNS issues and try again.

{"status":"API Key is not scoped for this domain"}

The API Key is not valid for the From domain. Please modify the API Key permissions: modifying-credentials

Track the delivery status of messages

To track the delivery status of specific messages and provide user feedback, you can include a custom Message-ID header in your outgoing emails. Transactional Email Service will return this same Message-ID in the webhook payload, allowing you to correlate webhook events with the original messages. This enables reliable tracking and logging of individual email deliveries within your application.

Example (API):

{
  "to": "customer@example.com",
  "subject": "Test Bounce Scenario",
  "text": "This is a message.",
  "headers": {
    "Message-ID": "12345abcde"
  }
}