Many of our users say the accuracy of our spam filter is one of the key reasons they love Gmail. And while we think you should never have to look in your spam folder, we know some of you may want to know why the messages there were marked as spam.
So starting today, we’ll be showing a brief explanation at the top of each of your spam messages. Simply look at any message in your spam folder and now you can find out why it was put there and learn about any potentially harmful content within the message.
Help articles from Google explaining why Spam can be dangerous.
Thx Don Burke.