In today’s business environment, business-critical processes rely heavily on networked applications to be productive. When a failure occurs, productivity is lost, and this often translates into lost revenue for the company. This is especially true of email. To address these issues, companies can implement a high availability/failover strategy. Some of our MDaemon users have asked for information on setting up failover for their email infrastructure, so we’ve put together a guide to help MDaemon administrators achieve this.
In the simplest terms, the way this works is this: You’ve got a primary server that is running MDaemon. You have a backup server that will take over as the mail server when a failure occurs on the primary server. No third-party tools or applications are required. With a bit of preparation, you can implement failover/redundancy between two MDaemon servers using software tools that are built into the Windows operating system.
The following is a complete list of requirements needed to implement this solution in a network environment:
- Two Windows 2008R2 Servers
- MDaemon 14.5 or later must be installed and configured on both servers with the MDaemon Windows service start-up option set to ‘Manual’
- The Windows Network Load Balancing Feature must be installed and configured on both servers.
- A third NLB ‘control server’ for making changes to the NLB configuration on the cluster nodes.
- A working Active Directory environment with a Windows Server 2003 or higher domain functional level.
- Microsoft’s Distributed File System Replication feature installed on both servers with the latest available DFSR updates and patches.
- For networks using Network Address Translation (NAT), a NAT rule to NAT outbound connections from both cluster hosts to the same public IP source address.
Other helpful guides can be found on our Literature page.