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> Apart from trusting the filename extension? Examining the first few
> bytes of the attachment for non-ASCII characters (excluding UTF
> encoding markers) is the only thing that springs to mind.
> File::Type perhaps? Or is that overkill?
File::Type wouldn't be overkill if Content Type is missing.
I also think if the Content Type is missing completely, wouldn't that be
a good rule? Any indicators that this happens with Ham?