feat: add email domains (#1895)

Implemented Email Domains which allows Platform/Enterprise customers to
send emails to recipients using their custom emails.

apps/documentation/pages/users/documents/email-preferences.mdx

@@ -0,0 +1,26 @@
+---
+title: Email Preferences
+description: Learn how to set the email preferences for your team account.
+---
+
+import Image from 'next/image';
+
+import { Callout, Steps } from 'nextra/components';
+
+# Email Preferences
+
+Email preferences allow you to set the default settings when emailing documents to your recipients.
+
+## Preferences
+
+Email preferences can be set on either the organisation or team level.
+
+By default, teams inherit the preferences from the organisation. You can override these preferences on the team level at any time.
+
+To access the preferences, navigate to either the organisation or teams settings page and click the **Email** tab under the **Preferences** section.
+
+![A screenshot of the organisation's email preferences page](/organisations/organisation-email-preferences.webp)
+
+- **Default Email** - Use a custom email address when sending documents to your recipients. See [email domains](/users/email-domains) for more information.
+- **Reply To** - The email address that will be used in the "Reply To" field in emails
+- **Email Settings** - Which emails to send to recipients during document signing