This example shows how to enable an existing domain in your hMailServer installation. The script is written in VBA.
Dim obApp
Set obApp = CreateObject("hMailServer.Application")
' Authenticate. Without doing this, we won't have permission
' to change any server settings or add any objects to the
' installation.
Call obApp.Authenticate("Administrator", "your-main-hmailserver-password")
' Locate the domain we want to add the account to
Dim obDomain
Set obDomain = obApp.Domains.ItemByName("example.com")
obDomain.Active = True
obDomain.Save