Activate the Postfix multiple instances feature

Multiple Postfix instances will provide a specific MTA for organizations added in your server.
This may be a simpler way to configure a multi-function Postfix system.
With multiple Postfix instances, each instance has its own directories for configuration, queue and data files, but it shares all Postfix program and documentation files with other instances

  • On the top toolbar, click on the Postfix MTA system icon.
  • On the status section, click on Multiple Postfix Instances Icon.
  • Turn to green the Activate Multiple instances option.


When enabling multiple Postfix instances feature, the main process will be disabled and switched to listen only loopback address ( in order to serve WebMails and forwards all mail to a central mail hub.
Each organization will be able to manage their own instance and the Interface will be changed to provide this feature.