how to setup auto invoicing via batch

We would like to setup a batch job to automatically email invoices directly to the customer.

We have set the customer print management to the desired email account.

From my AX2009 client,Using AR\periodic\sales update\invoice, we have queried the desired invoices to be posted and emailed. The customer is sent the invoice to their email address. however i was told this may not work via batch because the outlook client is needed. Is this true?

I have searched but not found a good document that provides setup instructions for auto invoicing via batch to include emailing the customer. any information you may have would be greatly appreciated!

Thanks, Darlene