Why not just send the URL that the graph generates in the email and let the user determine how they want to save it? Presumably, you can create a URL that encodes all the necessary parameters that you will need if you are going to create it programmatically anyway (at least if you want it to be easy). Alternatively, you may have an HttpHandler (ashx) that does the conversion (as @Marc describes) and sends the PDF back. In any case, you will reduce your email address.
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