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  • In this research, the design of zimbra high availability is discussed on multiple mail servers.Multiple mail server is a server scheme that each server is separated to maintain optimal server performance.This scheme is done if the number of users in the company or organization is already very large and each user sends a lot of emails in one day. In this research using a failover technique to obtain a high availability multiple mail server scheme.High availability server is the ability of a system to continue its functions without interruption for a long time.Failover serves to back up services that are at risk of errors, one of which is LDAP.Failover can also be a solution to optimize the multiple mail server scheme. Mail servers that are built with multiple mail server high availability schemes with failover techniques get the optimal mail server compared to the usual multiple mail server scheme.High availability servers can work well in the multiple mail server scheme using the failover techniques.