user interface

Most modern web-based email systems have decent spam filtering (I've used gmail and yahoo). Anything that looks like spam gets filed into a "spam" folder. Pretty straightforward, right? One thing that strikes me about these systems is that the spam folder has a "Delete Forever" button, while normal mail folders have a regular "Delete" button. The difference is that the "Delete" button sends deleted messages into the trash, while the "Delete Forever" button obliterates the spam completely. The "Delete Forever" button should be replaced with a regular "Delete" button for the spam folder, and here's why: