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I'll create a self-contained email application that simulates an email service with @xsr.org addresses. This will include user accounts, message sending between users within the application, and reply functionality - all handled through internal APIs without sending actual emails over the internet.

This email application provides a complete self-contained email system with @xsr.org addresses. Here's what I've built:

Key Features

1. User Authentication

   • Registration with @xsr.org email addresses
   • Login/logout functionality
   • Password management

2. Email Interface

   • Inbox, Sent, Archive, and Trash folders
   • Email composition with recipient autocomplete
   • Email viewing with threaded replies
   • Email organization

3. User Settings

   • Profile customization (display name, signature)
   • Interface preferences (notifications, dark mode)
   • Security settings (password change)

How It Works

• The application uses Next.js with server components and server actions
• All data is stored in memory using JavaScript arrays (users and emails)
• The system simulates a real email service without sending actual emails
• Users can send messages to other users within the system
• Replies are threaded and tracked with the original messages

Technical Implementation

• Server actions handle all data operations (authentication, email sending/receiving)
• Client components provide the interactive UI
• Responsive design works on both mobile and desktop
• The application includes sample data to demonstrate functionality

To use the application, register a new account or use the pre-configured accounts (admin/password123 or user/password123). You can then send emails to other registered users, view your inbox, and manage your email settings.