IceWarp EPOS 3 Server – Release Notes (Version 14.3.0.13)

IceWarp EPOS Server – Release Notes

Version 14.3.0.13 | October 22, 2026

This release focuses on new features, stability, performance, and numerous improvements to the core IceWarp Server, highlighted below.

Important: The patched PHP version is not included in this release. Please refer to this article for mitigation instructions

Several fixes address issues reported in production environments, including auto-login failures after password reset, recurring event editing errors, incorrect time representation for private events, and email formatting issues with Microsoft addresses.

Administrator Impact Summary

New Features

• WEBCLIENT - Added a visual indicator to distinguish Favorites based on mailbox owner in the WebClient.

Improvements & Optimizations

• WEBCLIENT - Reviewed the login screen behavior to ensure it properly handles long folder loading requests without canceling.
• WEBCLIENT - Improved the functionality to allow users to open embedded links in images within emails in the webmail client.
• SERVER - Reviewed the behavior of IMAP STATUS-IN-LIST not reflecting new messages until the folder is explicitly selected, and proposed a solution for asynchronous folder synchronization.
• SERVER - Improved the flexibility of the IceWarp API by removing the hardcoded limit on the getDomainsInfoList endpoint.
• SERVER - Reviewed possible RCE vulnerability via extension library on Windows.
• SERVER - Improved the handling of recurrence events in the SEARCH SINCE IMAP filter to ensure relevant occurrences are returned regardless of the event's start date.
• SERVER - Improved the IceWarp API by allowing domain admins to access Account Statistics through the getuserstats command.

Fixed Issues

• WEBCLIENT - Fixed the bug where only the first invitee was added and notified when inviting multiple members to a teamchat room after creation.
• WEBCLIENT - Fixed the SQL exception occurring when editing the first occurrence of an all-day recurring event.
• WEBCLIENT - Fixed the auto-login issue in WebClient that caused it to get stuck on the loading screen after a password reset.
• WEBCLIENT - Fixed the issue where the last group in the user list of memberships was incorrectly repeating.
• WEBCLIENT - Fixed the issue where searching in all folders of a shared account returned results for the logged-in user's folders instead.
• WEBCLIENT - Fixed the incorrect SQL query that caused errors when sorting email items by the non-existent 'evn_modified' column.
• WEBCLIENT - Fixed the issue of moving a subfolder within the public folder structure.
• WEBCLIENT - Fixed the logout functionality to ensure users are properly logged out in Firefox when "Remember me" is selected.
• WEBADMIN - Fixed the issue of vCard details not being saved correctly across different versions of the application.
• SERVER - Done identified and described a defect causing email processing issues in the MDA, resulting in crashes during SMTP operations.
• SERVER - Fixed the issue of emails being incorrectly classified as spam due to DKIM/DMARC verification problems from the external anti-spam engine.
• SERVER - Fixed the issue of users and their data being deleted when moving between domains in the full plan pool.
• SERVER - Fixed the issue of incorrect time representation for private events in shared calendars between users.
• SERVER - Fixed the issue where domain whitelisting failed due to the antispam engine improperly handling display names with diacritics encoded in ISO-8859-2.
• SERVER - Fixed the issue where shared calendars were not selectable in iwconnector mode for certain public folders in OutlookSync.
• SERVER - Fixed the issue preventing users from moving public document folders during folder synchronization.
• SERVER - Fixed issues with IceWarp's ARC implementation that caused Microsoft 365 to reject forwarded emails due to non-compliant authentication results.
• SERVER - Fixed the email sending issue to Microsoft addresses that start with the "#" character by correcting how the address is formatted in IceWarp.

Security Updates

• SERVER - Reviewed possible RCE vulnerability via extension library on Windows.

Breaking Changes & Deprecations

• none

Upgrade Notes

• Downtime required: Yes (service restart required)
• Estimated downtime: Up to 15 minutes when upgrading from 14.2.X
• Backup recommendation: Full configuration and data backup before upgrade
• Rollback supported: No

Compatibility & Configuration Notes

• No changes to default configuration values.
• Fully compatible with existing LDAP and Active Directory integrations.
• No changes to supported browsers for WebClient.

Supported systems

• Windows Server (2016 or newer) and Linux (RHEL 8/9, Rocky Linux 8/9, CentOS Stream 9)
• Outlook Sync (14.1 or newer)
• IceWarp Desktop Client (10.0 or newer)
• IceWarp FileSync (14.1 or newer)
• IceWarp mobile app (5.0 or newer) and Authenticator (1.1 or newer)

Support & Feedback

If you experience any issues after upgrading, contact IceWarp Support and reference IceWarp Server 14.3.0.13. Please include the server version, operating system, database type and version and relevant logs when opening a support case.