In general you will let your "printing solution" do this for you (Streamserve/Formscape/Optio/other) because you will probably need a specific Document Lay Out. In practice this means that you print to the "virtual printer" and this application takes care of the emailing and "pdf" archiving of the document.
Most time you "mark" a customer as email customer and during printing this flag will trigger emailing and pdf archiving. So, a little bit functional and a little bit technical to get this solution working :-)
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