So a sent email will differ greatly from, for example, a landing page, an event, a drafted email, or the webpage version of an email. Deleting the image should remove these images from those applicable campaigns / statuses. However an email that's been sent out will contain the image itself, since it was embedded into it. If an image was inserted through URL, then breaking that URL may affect the sent email, but otherwise images regularly inserted into emails and sent out would still contain those images.
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