This upgrade updates your current Libra Esva to version 4.0

BUG Fixes

- HTTPD Service crashes
- Duplicated whitelist entries error
- Dangerous content release override with nested archives fixed
- Backup job errors fix
- Cluster wizard bug on the second cluster setup
- Rule Score Override Bug
- Full UTF-8 Custom Spam Rules Support
- Add domain bug
- SSL chain not used in apache configuration
- Blacklisting not working if message is not in quarantine
- Maillog download bug
- LocalRBL Performance issues
- Password protected zip archive release bug
- ISP API request protocol

New Features / Changes

- New Web UI
- URL Sandbox filtering feature
- High Availability Distributed Setup
- New Graymail Plugin
- Let's Encrypt Certificates support
- Added forward action for clean messages
- Filechecks archive options now are on a per domain basis
- Quarantine Ask to Release email notification to admin
- Separate Clean Messages Quarantine Retention setting
- Bounced emails filter added to search function
- New API functions
- SMTP Delay warning time option added
- Extension .jar is now blocked by default
- Core engines updated to latest available versions
- Libra Esva up to date status