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Amazon is making it impossible to remove the DRM from Kindle Books
(goodereader.com)
This is a most excellent place for technology news and articles.
Since at some point recently. You can still email files (epub not mobi now) to your kindle, but usb transfer doesn't work any more.
Have you got a link to more info about it? I can't find details anywhere.
Your "Send to Kindle" email address is in your profile details, under devices and apps. In the app (Android) it's under settings.
https://www.amazon.com/gp/sendtokindle
Sorry, I meant any more details about sending books to kindle via USB - I've never had any issue doing this.