Has anyone come up with a automatic way to sent out emails of the PDF, of invoices to selected custo

We currently are on 810/896 tools release, Terminal server.

We are currently print all invoices .

We then have customer service go throught then and validate the prices are correct.

We then run sale update to releave inventory.

Finally we mail out the Original invoice or reprinted ones if the prices needed to be changed.  (we use Create Form)

We have customers who want us to email the invoices to them.

I seem to remember a way to do this with Purchase  Orders.  Has anyone come up with a method to do it with Invoices.

(EDI does not seem to be a options since the cost are to high for our purposes)