Hi Steve,
Does your client set a 'Default Ship To Code' on the AR Customer, from the Invoicing tab? If they don't currently do this, you can create a Ship-To code in OE that contains the desired confirmation email address, and assign this ship-to code on the customer.
When an order is created for this customer, the ship-to code is automatically loaded (the entry person doesn't have to remember) and the email address from the ship-to code is automatically added to the order (the entry person doesn't have to remember to type it in).
If they already utilize ship-to codes for their customers, just add the email address on the existing ship-to code. And these can be imported instead of manually entered, to make adding these records/changes quicker.
Is there anything else? If so, you then really are looking for default email addresses for every possible document type (pick slip email, order confirmation email, and so on).
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Regards,
Softrak Tech Support