IceWarp EPOS 3 Server – Release Notes (Version 14.3.0.3)

IceWarp EPOS 3 Server – Release Notes

Version 14.3.0.3 | April 13, 2026

Welcome to the next generation of IceWarp Server, marked as Generation 3. This release focuses on major new features, stability, performance, and numerous improvements to the core IceWarp Server. It combines improvements and fixes from builds 14.3.0.0 to 14.3.0.3, highlighted below.
Several fixes address issues reported in production environments, including an updated OpenSSL, improved antispam processing for outgoing messages, new Sophos antispam in Docker, enhancements to the Exchange Active Sync protocol and support for DMARC, ARC and DANE.

Administrator Impact Summary

Major Features

• Emails on mobile - Access your email from the IceWarp mobile application (iOS limited)
• Webinar mode - New Webinar mode to host interactive live sessions
• New Instant Messaging (IM) – Chat one-on-one or in Groups with threaded messages, rich formatting and polls.
• Booking – Simplify online appointment scheduling for your business.
• Sophos - New antispam engine in Docker
• DMARC - Protecting sender adentity on Message authentication & policy layer
• ARC - Maintaining trust through forwarding on Authentication preservation layer
• DANE - Securing server-to-server encryption on Transport security layer

Additional New Features

• SERVER - New feature: 7zip archiver replaced with libarchive. (build 14.3.0.3)
• SERVER - Improvement in remote console - added count of all synchronized devices via Active Sync. (build 14.3.0.3)
• SERVER - Added a new feature - resources are now alphabetically sorted. (build 3.0.2)
• OUTLOOK SYNC - Added a new feature to enable the automatic sync from the context menu. (build 14.3.0.1)
• OUTLOOK SYNC - Added notification about new message in default Outlook notifications. (build 14.3.0.0)

Improvements & Optimizations

Build 14.3.0.3

• WEBCLIENT - Improved handling of uploading two or more files with the same name.
• WEBCLIENT - Improved storing of custom backgrounds - all the backgrounds are now being stored in the default Background folder.
• WEBCLIENT - Added search in emoji picker in email compose window.
• WEBCLIENT - Changed keyboard shortcut for copying email - now it is Shift + C
• WEBCLIENT - Improved loading of emails.
• WEBCLIENT - Improved rule action to tag a matched email with a custom tag.
• WEBCLIENT - Improved handling of 'To' field for users in a space with a name.
• WEBCLIENT - Added restriction to disable avatars.
• SERVER - Reviewed DKIM signature handling for auto-forwarded emails received internally to external recipients.
• SERVER - Added a new feature allowing users to mark their chats as unread.
• SERVER - Updated OpenSSL to a newer version.
• SERVER - Reviewed processing of antispam for outgoing messages for trusted IPs.
• SERVER - Added the possibility to use the asterisk sign for Black/Whitelisting domains.
• SERVER - Improved security by disallowing plain HTTP connections, enforcing TLS usage, and strengthening authentication to prevent interception and unauthorized access.
• SERVER - Improved the remote console so it does not need OS administrator rights.
• EAS - Improved SmartForward and SmartReply in the Exchange ActiveSync protocol.
• MOBILE APP (iOS) – Added progress indicator to file upload in Notes and Emails (build 6.02)
• MOBILE APP (iOS) – Redesigned Conferences recording cell (build 6.02)
• MOBILE APP (iOS) – New Conferences SDK (build 6.02)

Build 14.3.0.2

• WEBCLIENT - Improved loading of emails.
• WEBCLIENT - Improved Instant Messaging by adding "Last seen" time for offline contacts.
• WEBCLIENT - Reviewed handling of shared email to TeamChat to avoid a possible XSS.
• WEBCLIENT - Improved deleting one occurrence instead of a whole recurrence in the conference module.
• WEBCLIENT - Improved handling of disabled accounts or domains by automatically disabling their sessions.
• SERVER - Fixed an issue when the user couldn’t work with fields in the Spreadsheet in WebDocuments that were protected (locked) by himself.
• SERVER - Reviewed loading of shared calendar folders with IMAP protocol.

Build 14.3.0.1

• SERVER - Improved authorization to Remote Console.

Build 14.3.0.0

• WEBCLIENT - Cross-site scripting vulnerability has been addressed in WebClient
• WEBCLIENT - Improved Search in All subfolders for documents.
• WEBCLIENT - Improved Read/Unread mail visibility.
• WEBCLIENT - Improved SMS password recovery.
• SERVER - Improved handling of calendar invitation replies.
• SERVER - Preventing random downloading of 0kB files via WebDAV protocol
• SERVER - Small changes in the attendee's calendar event do not trigger "Propose new time" action via CalDAV
• SERVER - Improved search for GroupWare items.
• SERVER - Improved deletion of uploaded files that have been attached and never used.
• SERVER - Reviewed the autoupdate of the antivirus engine.
• SERVER - Improved handling of custom domain path for groups.
• SERVER - Reviewed usage of the filesystem by the POP3 module.
• OUTLOOK SYNC – Improved support for non-standard ports in Autodiscover.

Fixed Issues

Build 14.3.0.3

• WEBCLIENT - Fixed sending SMS from WebClient.
• WEBCLIENT - Fixed a bug in opening an email as another email's attachment.
• WEBCLIENT - Fixed the mechanism of creating a guest account.
• WEBCLIENT - Fixed an issue with updating or deleting an occurrence of a recurring event.
• WEBCLIENT - Fixed a bug causing spontaneous layout changes.
• WEBCLIENT - Fixed an issue with snoozing event reminders.
• WEBCLIENT - Fixed various calendar issues, mostly occurrence/exception of recurring events.
• WEBCLIENT - Fixed pinning of TeamChat posts.
• WEBCLIENT - Fixed a bug causing unfunctional quarantine reports on Windows servers.
• WEBCLIENT - Fixed keyboard shortcuts interactivity while focused in the email body in the email preview.
• WEBCLIENT - Fixed an issue with handling event invitations with attachments received from Google Workspace.
• WEBADMIN - Fixed the setting of Smartdiscover on the domain level.
• SERVER - Fixed an issue where the outage of the accounts database causes Control to copy the entire mail folder into an arbitrary user's account.
• SERVER - Fixed an issue with losing event or task attachment.
• SERVER - Fixed SPF validations for domains with many TXT records.
• SERVER - Fixed a bug in saving email delivery rules with API.
• SERVER - Fixed a bug causing the impossibility to send a user the activation keys or sending them with incorrect translation.
• SERVER - Fixed the generation of PDF file thumbnails on Windows servers.
• SERVER - Fixed a bug causing duplication of the public folder inbox in the folder tree.
• MOBILE APP (iOS) – Fixed an issue with decoding email settings (build 6.01)
• MOBILE APP (iOS) – Fixed an issue with formatting mentions in messages (build 6.02)
• MOBILE APP (iOS) – Fixed an issue with hiding options and adding comments inside threads (build 6.02)
• MOBILE APP (iOS) – Fixed an issue with the application crashing while reading a push notification (build 6.02)
• MOBILE APP (iOS) – Fixed an issue with the application crashing while performing actions in the email list (build 6.02)
• MOBILE APP (iOS) – Fixed an issue with message size used in the list of mentions and pins (build 6.02)

Build 14.3.0.2

• WEBCLIENT - Fixed accessing WebClient via the troubleshooting link.
• WEBCLIENT - Fixed an issue with the missing original email body in email reply.
• WEBCLIENT - Fixed an issue with adding the birth date year to contact details.
• WEBCLIENT - Fixed an issue with content that cannot be selected in the email preview subject.
• WEBADMIN - Fixed uploading .csv files while using Mozilla Firefox.
• SERVER - Fixed a bug that deletes group content while the group has been disabled in Active Directory.
• SERVER - Fixed an issue with saving login restrictions via WebAdmin.
• SERVER - Fixed an issue with generating the Jitsi Certificate, causing conference unavailability.
• SERVER - Fixed migration of accounts database from SQLite to MySQL.

Build 14.3.0.1

• WEBCLIENT - Fixed an issue with marking emails as read in shared accounts' inbox.
• SERVER - Fixed the function "Delete older mails than".

Build 14.3.0.0

• WEBCLIENT - Fixed an issue with read confirmation.
• WEBCLIENT - Fixed an issue of forwarding multiple emails as attachments at once.
• WEBCLIENT - Fixed showing of mailbox quota.
• WEBCLIENT - Fixed an issue where WebClient may get stuck in the loading process.
• WEBCLIENT - Fixed an issue of displaying emails with the Buddha calendar.
• WEBCLIENT - Fixed opening SmartAttach in message forwarding dialogue.
• SERVER - Fixed IMIP invitation causing bare LF.
• SERVER - Critical vulnerability in File handling has been addressed
• SERVER - Fixed a bug causing stacking of emails in the outgoing queue.
• SERVER - Fixed an issue with authorizing the SMTP service.
• SERVER - Fixed a bug causing the impossibility of getting new files in WebDAV.
• SERVER - Fixed an issue with revalidating the conference certificate.
• SERVER - Fixed an issue with regex header rewrite not working on MIME-encoded headers.
• SERVER - Fixed an issue with sending invitations to newly added attendees after suppressed notifications.
• SERVER - Fixed incorrect server response when an online meeting is accepted.
• SERVER - Fixed an issue with displaying public groups.
• SERVER - Fixed a bug in importing events with different time zones.
• SERVER - Fixed a bug with displaying only the last added resource in Calendar.
• SERVER - Fixed an issue causing the remote accounts not to sync.
• SERVER - Fixed an issue where SpamAssassin incorrectly assigned RDNS_NONE due to missing PTR record queries.
• SERVER - Fixed a bug that caused the improperly displayed user list in WebDAV.
• OUTLOOK SYNC - Fixed AccessViolation Exception in IceWarp Outlook Sync after sync of a new account.

Security Updates

• WEBCLIENT - Reviewed handling of shared email to TeamChat to avoid a possible XSS.
• SERVER - Updated OpenSSL to a newer version.

Breaking Changes & Deprecations

• Using latest OpenSSL 3.x, ancient TLS no longer supported
• XMPP now available only through XMPP bridge

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 (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 14.3.0.3. Please include server version, operating system, database type and version and relevant logs when opening a support case.