AI-generated content is everywhere now: From restaurant menus and student essays to full-length movies and social media posts, AI is churning out huge amounts of text, images, audio, and video. In some digital spaces, it's overwhelming human-made content.

But what about your inbox? Just how many of your friends, family members, clients, and colleagues are using AI to compose their emails? Is that store newsletter you just signed up for written by a real person or a bot? It's not always easy to tell.