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It is still clearest to write 'e-mails' with a hyphen, because (even if the context is obvious) the word 'Email' is the noun for 'enamel' in a number of other languages. (Enamel is a very hard substance that forms the outermost layer of your teeth, and it is used in hardening household things such as sinks, bathtubs and toilets, and also for heavy cooking pots etc.)