1. Mail module enhancements
   - Added comprehensive mail file management system with listing, viewing, and searching functionalities
   - Enhanced mail image verification flow with protection mechanisms and sensitive content handling
   - New components: MailChatAttachment and MailChatImage for better mail attachment handling
   - Mail files archive tables now maintain consistent structure
   - Improved file details display in mail history
   - Better handling of mail file verification and download permissions

2. User management improvements
   - Added job title field to user department alias functionality
   - Enhanced user department attributes with additional customization options
   - Improved validation and structure for user department relationships

3. BBCode and URL handling enhancements
   - Added URL whitelist functionality for BBCode configuration to control link visibility
   - Enhanced URL obfuscation in BBCode parser with whitelist support
   - Improved BBCode URL handling and file extraction in messages
   - Added Message class for better file extraction functionality
   - Enhanced security and user control over link visibility

4. File and image handling improvements
   - New permission system for file verification with granular access control
   - Allow non-image files to download with proper verification
   - Enhanced file reveal functionality and logging capabilities
   - Improved image attributes display in file edit window
   - Better styling for reveal image actions

5. Mail search and performance optimizations
   - Enhanced mail search using message_id for improved performance
   - Better handling of mail file operations and verification flow
   - Optimized database queries for mail-related operations

6. System configuration enhancements
   - Added default system time zone variable for better timezone handling
   - Option to see SMTP debug information for troubleshooting
   - Enhanced SMTP settings form and tab navigation
   - Improved audit configuration and logging capabilities

7. Security and data handling
   - Fixed JSON export formatting with Unicode support and pretty printing (#2283)
   - Enhanced security for file downloads and verification
   - Better handling of sensitive information in mail attachments
   - Improved agent name escaping in various contexts

8. Performance and stability improvements
   - Combined department and department group results for better consistency
   - Merged department ID filters for improved data consistency in statistics retrieval
   - Enhanced message handling logic in fetch operations
   - React app version updates and script reference adjustments
   - Better content fetching and caching mechanisms

9. UI and UX improvements
   - Enhanced file body parsing and embed functionality for chat files
   - Improved styling and visual feedback for various components
   - Better handling of verification states and user interactions
   - Enhanced modal windows and form interactions

10. Developer and debugging improvements
    - Option to skip request body in logging for performance
    - Enhanced debugging capabilities with better logging options
    - Improved database structure documentation and references
    - Better error handling and validation throughout the system

For update just follow standard update procedure. For manual update it's update_336.sql

**Full Changelog**: https://github.com/LiveHelperChat/livehelperchat/compare/4.67v...4.68v