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Custom SMTP servers can be specified in WebWorkbench configurations.
Workbench Users (Active Directory Security) Group
The recommended configuration is to create a 'Workbench_Users' Active Directory (Global) Security group, which Workbench user (Active Directory) accounts are added too. The required system permissions are then assigned to the user group. The Workbench Users group is normally granted access to the Workbench Application Share, SQL Server, and other Workbench components.
Workbench Application Share
The Workbench server hosts the Workbench Application folder, which is shared on the network. This folder needs to be accessible to the all Workbench client PC's / users, and other Workbench components if they are hosted on different servers.
PowerShell
PowerShell v5.0 or higher should be usable by available to the Workbench administrator.