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According to Zoho, the recipient is unable to copy/print such a mail.
But they have to be able to SEE it. It's not clear from that page whether they see it in their browser or via some special program - but if the latter were the case how do Zoho provide a program that works on every platform including minority ones?
I can't see how anyone can stop a recipient from screenshotting the view of the email. You can print a screenshot.
It might be possible to use fancy Javascript to disable in-browser screenshots, but surely not OS-level features?
Failing that, anybody could take a photograph of a screen. You can print a photo.
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