Support for DNS server load balancing (failover)
Add option to balance load between multiple DNS-servers. Now Kerio queries just one DNS server, of provided in "custom DNS forwarding" section.
It will be useful to query all servers in random order, or, the better way - send all queries parallel to all DNS-servers and process fastest response.
For example my ISP provides fast but not very stable DNS servers, and I want to have a backup global DNS servers.