It's true that in order to forward an email to
spam@beethoven.com, you must first open the email. However, it is easy to move a message from the inbox to the spam box from the web-based email index screen. Simply check the spam messages, then at the bottom of the screen you'll find a pull-down selection for what box you want to move the message to. Select "spam" and click the "move to" and it's gone.
I know that the Yahoo email program includes a way to tell the email filter that a message is spam without opening the message, and it seems to work quite well. Kevin and staff, if you are interested in wish lists, that feature is on mine as well.
But I still think beethoven email is one heck of a bargain - it's the personal account I use most!