SPAM
The worse thing about SPAM, imo, isn't dealing with having to delete it. Using MailWasher I can do that fairly easy and it doesn't take all that much time. The real issue is that I'm always worried that I'm getting mail from someone that I haven't marked as a friend, that is legit, and their address just looks like SPAM. So now I'm at least bringing up the beginning of the mail in MailWasher so I can check. How annoying.