Features
✅ Automatic SMTP detection for Gmail, Outlook, and more
✅ CSV and Excel file support
✅ Email personalization with {{field}} syntax
✅ Multiple attachment options:
- Upload files (same for all recipients)
- Specify file paths (same for all recipients)
- Individual attachments per recipient via Excel column
✅ All attached files keep their original names
✅ Real-time progress tracking
✅ Export send status to Excel with detailed delivery reports
✅ Rate limiting and error handling
✅ Professional, modern UI