Implemented UIDPLUS IMAP extension, enhanced tag validation, and upgraded web UI API key security

• Implemented the UIDPLUS IMAP extension (RFC 4315) to enable efficient, high-performance UID-based message synchronization and management using APPENDUID and COPYUID commands
• Refined IMAP command parsing with strict validation of command tags, resolving minor protocol compliance issues and improving overall mail client compatibility
• Upgraded web interface security by masking sensitive API keys (AbuseIPDB, OpenAI, Gemini) behind password fields by default, adding custom toggles to safely reveal them as text

Improved IMAP protocol compliance and database reliability

• Resolved database integrity issues that occurred when copying messages between folders via IMAP COPY command, ensuring reliable message duplication across mailboxes
• Enhanced IMAP protocol compliance by implementing strict validation of command tags to allow only alphanumeric characters, preventing potential protocol violations and improving client compatibility

Enhanced admin interface, database performance, and IMAP search reliability

• Resolved stability issues in the Admin Web Interface when managing user accounts, ensuring smoother account management operations
• Optimized SQLite database access patterns for improved performance and reduced query latency across all operations
• Fixed IMAP SEARCH command compatibility issues with complex search criteria, ensuring reliable email filtering and retrieval
• Added a method to manage IMAP folders using the Web interface, including creating, renaming, and deleting folders

Real-time notifications and forward address fixes

• Bounced messages now trigger real-time notifications to IMAP clients and the Web interface for immediate visibility
• Fixed an issue preventing Forward Address settings from being updated correctly

Improved bounced message formats

• Bounced messages now include detailed error information and are formatted according to RFC 3464.
• Minor improvements to the admin web interface for Services.

Updated default TLS and client certificate settings

• Updated default settings for TLS and client certificate usage to enhance security.

Removed debug information

• No significant changes. Removed debug information. It would make the packages smaller and more efficient.

Fixed an issue with delivery queue

• Fixed a problem with items getting "stuck" in the Delivery Queue in the "Processing" state

Real-time delivery monitoring and IP management improvements

• Added ability to modify Next Delivery Attempt time for items in the Delivery Queue
• Added real-time updates to Delivery Queue with live status changes as deliveries are processed
• Added sorting and pagination to Blocked IP Addresses database for easier management

Admin web interface enhancements (Delivery Queue)

• Added sortable columns on the Delivery Queue page including Created, From, To, Target Domain, Next Attempt, and Total Attempts
• Added ability to select multiple delivery queue items using checkboxes and delete them in batch
• Improved UI with visual sort indicators showing current sort column and direction

Security updates and web interface enhancement

• Updated third-party packages to address security vulnerabilities
• Added ability to permanently purge all messages from Deleted Items and Spam folders on the Web interface

Switch to .NET Core 10.0

• Switched to .NET Core 10.0
• Added a progressbar to the spam statistics on the admin web interface

IMAP protocol and Web interface fixes

• Fixed an issue where message flags were not preserved when copying messages between folders using IMAP protocol
• When viewing the Deleted Items folder on the user Web interface, the delete button now permanently removes messages

Changes on primary SMTP connection

• Added an option to disable SMTP authentication on the primary SMTP listener. This helps reduce brute-force attack attempts.

Fixed connections on secure ports

• Fixed an issue where direct connections to secure SMTP, POP3, and IMAP ports were not working. Secure connections were only functioning through STARTTLS

Admin web interface changes (Delivery Queue)

• Added ability to view message content for items in the Delivery Queue
• Added a Refresh button to the Delivery Queue

Admin web interface changes

• Added statistics on addresses reported to AbuseIPDB
• More minor updates on the admin web interface

Gemini AI spam filtering

• Added spam filtering using Gemini AI
• Minor updates on the admin web interface

Enhanced email message display

• When viewing the Sent Items folder, now displaying To recipients instead of From headers for better clarity
• When viewing a message, now displaying To and CC recipients in the message header