Overview
Kerio Connect 10.0.9 (build 9754) has been released and is available for download:
- Release date: 2026-03-25
- Build ID: 9754
Changes in this release
- Resolved agent log locking issue
- Fixed a regression with default email signatures not saving in Outlook Connector (Remove and Recreate the Profile)
- Implemented TCP fallback for truncated DNS responses
- Resolved misleading 2FA cookie token verification error messages
- Fixed security issue where allowed relay IPs bypass spam filtering
- Enhanced licensing enforcement during Active Directory synchronization
- Prevented GFI Agent from auto-enabling after upgrades
- Improved SMIME certificate handling for encrypted messages
- Fixed calendar file (.ics) preview encoding in Outlook Connector - (Remove and Recreate the Profile)
- "All Folders" Search feature fixed in New Connect UI
- Removed Kerio Connect Nano
- Enhanced Exchange Web Services (EWS) compatibility for third-party clients, fixing the following:
- Error 108: "Not implemented only CategoryList configuration is supported" (GetUserConfiguration)
- Error 339: "Only traversal type Shallow is supported" (FindItem)
- Error 339: "Unsupported restriction type" (Filtering Operations)
- Added RFC 8058 compliance by including List-Unsubscribe headers in DKIM signatures for one-click unsubscribe support
Ciprian Nastase
Comments
Torben Lümkemann
After upgrading to 10.0.9 my Kerio server crashing all the time.
Roman Klíma
After upgrading to 10.0.9 in a Linux environment, the mailbox index is not running. After starting it manually and after cleaning /opt/kerio/mailserver/store/fulltext, it is still waiting for all mailboxes. It pretends that indexing is running, but it is not.
Marc Müller
Again the same backup problem as in the 10.0.8 release. On macOS, backups are created, but immediately deleted and not saved.