# InvoiceEmailNotSentReason

A model the API reference uses in a request or a response. The operation pages link every field typed as this model here.

Why an invoice email or a reminder email did not go out. Recorded on the invoice's activity timeline
and returned on the send response, so an operator learns the recipient was not emailed at the moment
the platform already knows it, without reading host logs.

## Values

| Value | Description |
| --- | --- |
| `NoRecipientEmail` | The invoice's recipient has no email address. |
| `NoTemplate` | The email template is missing or could not be rendered. |
| `TransportError` | The email service refused the message or could not be reached. |
| `Disabled` | The host is configured to deliver no email at all (log-only mode). |
| `Unexpected` | Something else stopped the email. The host log has the detail. |

## See also

- [All documentation](https://devportal.signapay-sbx.winkpg.io/llms.txt): the machine-readable index of every public page on this site.