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Because HTML, DOC, DOCX, JPEG, GIF, PNG, and BMP are usable through conversion only, and always have been available only through conversion. Those are the only formats that the Amazon email service handles. .mobi and .pdf, and .txt are the only formats read natively that are supported officially. If you got /images to work, good for you, but it isn't documented to work, and they could do an update and take away that capability.
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