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Assuming you're asking about Apple Mail, Edit > select the emails by tapping in the circle to the left each email you want to delete > tap Trash ...
 
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Assuming you're asking about Apple Mail, Edit > select the emails by tapping in the circle to the left each email you want to delete > tap Trash ...

thanks must have been an earlier version of iOS from a video I had referred to, which suggested selecting top and bottom circles, which auto highlighted e-mails before deletion. .
 
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