http://www.rememberthemilk.com/help/answers/sending/emailinbox.rtm describes how you can add "List: listname" to an emailed-in task to make the task appear in that list. However, if "listname" isn't the name of an existing list, the task appears in the inbox instead. Is it possible to have that list get created by the email and then have the named task added to it? Alternatively, if it's not yet possible, it would be very handy if it were possible :-)