How is this different from, say, Outlook addons ? Or thunderbird ones for that matter. As the message says, outlook addons react to message contents ... so of c

How is this different from, say, Outlook addons ? Or thunderbird ones for that matter. As the message says, outlook addons react to message contents ... so of course they need to access it. You are not protected from the software you choose to run. I find it a bit weird that you'd want that at all to be honest. But you can choose to run other software. If you're going to complain along these lines, I'd say browser plugins are so much scarier. They don't just have access to your mails, but to your web banking as well, and can (and have) for example override which account you transfer to, and how much.