How do you do a multiple selection in the default mail app? My server's spam filter works pretty well, directing most of the spam to my Trash folder, and very little "real" mail. So when I look in my Trash folder I might have 30 messages, and 28 of them are spam. How do I select all 28 of them for deletion in one fell swoop, so I don't have to tediously delete each one one-at-a-time? Thanks in advance.