Hello Lester,
David's right - only Adagio Receivables knows which invoices are overdue. The current way of letting a customer know their account (and which invoices) is overdue is to send them a statement. Then if they call, you can e-mail or fax them another copy of a specific invoice.
In the process that you are envisioning, how would your clients respond to 15 or 20 invoices suddenly showig up on their fax machine or in their e-mail in-box (since they'd arrive as separate e-mails)?
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Andrew Bates