What is displayed here (in the MAD section and in the AutoAwake list section) is the "class of the window", if you are a win-programmer you know what I'm saying, if not take this class as something that allow Taglines Shuffler to recognize other software's windows (your mail-program)
Some of them have a class name that simply matches with their name, other not, for example Eudora light 3.0 has "EudoraMainWindow", Outlook Express has "ThorBrowserWndClass", SoftArc's FirstClass has "SAWindow", and so on...
Some of these name might appear obscure, but I think,thanks to the pointer interface, that it will not be an hard task to associate a program with his "Class name".