WF-BATCH and SO16

Hello,

We are implementing SRM 7 SP 10 with ECS.

In SO16 we selected "Sent to Home addresses of Users" for users to get mail notifications.

But we need "No mail system group" for WF-BATCH. We need WF-BATCH to get his mails in his SAP Inbox otherwise /SAPSRM/OFFLINEAPPROVALGET can not proceed offline approval mails.

How can we have a specific setting for WF-BATCH ?

Thanks.