In today's world, this is mission critical and expected. The feature is built right into Mailenable which is where I keep having to set it up. It shouldn't take much work to get this integrated into Plesk for Windows installations. The settings can be set via powershell via the Add-PSSnapin MailEnable.Provision.Command to change the values on the poSmarthostOutboundEnabled settings. OR these settings can be modified by changing the values in the POSTOFFICE.SYS file within ~\Mail Enable\Config\Postoffices\(POSTOFFICE TO CHANGE). If you modify the file directly you may need to tell the services to restart, but I'm not sure.
In today's world, this is mission critical and expected. The feature is built right into Mailenable which is where I keep having to set it up. It shouldn't take much work to get this integrated into Plesk for Windows installations. The settings can be set via powershell via the Add-PSSnapin MailEnable.Provision.Command to change the values on the poSmarthostOutboundEnabled settings. OR these settings can be modified by changing the values in the POSTOFFICE.SYS file within ~\Mail Enable\Config\Postoffices\(POSTOFFICE TO CHANGE). If you modify the file directly you may need to tell the services to restart, but I'm not sure.