---
title: "EmailAttachment"
description: "The `EmailAttachment` entity."
section: "Reference"
group: "Types"
order: 80
---

## Definition

```ts
interface EmailAttachment {
  id: string;
  emailId: string;
  fileId: string;
  filename: string;
  mimeType: string | null;
  size: number | null;
  contentId: string | null;
  disposition: string | null;
  createdAt: string;
}
```

## Fields

| Field         | Type             | Notes                                                                    |
| ------------- | ---------------- | ------------------------------------------------------------------------ |
| `id`          | `string`         | `readonly` `required`                                                    |
| `emailId`     | `string`         | `required` — Email this attachment belongs to.                           |
| `fileId`      | `string`         | `required` — File record holding the stored attachment bytes.            |
| `filename`    | `string`         | `required` — Original filename from the MIME Content-Disposition header. |
| `mimeType`    | `string \| null` | `required` — MIME type reported by the sender, if any.                   |
| `size`        | `number \| null` | `required` — Size of the attachment in bytes, if known.                  |
| `contentId`   | `string \| null` | `required` — RFC-2392 Content-ID used for inline references, if any.     |
| `disposition` | `string \| null` | `required` — Content-Disposition value (e.g. 'inline', 'attachment').    |
| `createdAt`   | `string`         | `readonly` `required` — ISO-8601 timestamp of creation.                  |