Thank you for your reply. I understand there is no way to select multiple emails and delete en masse. Your explanation of how to delete was clear, but not to the point. I have over 25,000 emails. I want to delete about 23,000 of them. The inadequacy of having to delete them one at a time shouldn't need pointing out. I would like to request a feature for the iMail app: Figure out a way to click here, then shift-click there, so ONE MORE click will do whatever I want to that selection. Apply it to any list in any app in iOS. Make it easier for me to use my iPhone/iPad/iThing.
PS I've been using Macs since 1987, and everything since, including a bunch of iPhones. I know you know how. Please? Thank you.