Hello,
a simple scenario could be the following:
The company receives an order via email on the standard email-
account (e.g.
info@company.com). That email
will be either manually forwarded to "order entry" or, if the mail
is clearly "identifiable" as an order (e.g because the text string
"order" is found), or automatically forwarded to the person in
charge. This person writes an invoice, prints it out and the
"order entry system" generates a paper output, and a PDF.
Afterwards the "Order entry person " attaches this PDF with
drag and drop from the "Desktop" to the mail and writes for
example an additional note and attaches it as well to the mail.
John