2.1.7

• FEATURE: Added support clustering backend systems
• FEATURE: Added support for User Delivery Servers
• FEATURE: Added support for SmartHosts
• FEATURE: Added support for system wide instant search
• FEATURE: Added Database based distributed locking
• FEATURE: Added Scanner RAM disk support
• FEATURE: Added TLS support for all cluster servers
• FEATURE: Improvements to MTA cdb files
• FEATURE: PostgreSQL updated to version 10.1
• FIX: Remove old kernels
• FIX: Optimization of dbclean
• FIX: Optimization of DB queries
• FIX: Catch keyerror on missing LDAP mail attrib
• FIX: Improvements to search indexing system resource usage
• FIX: Generation of subject block list fails if unicode chars used