If you're just looking for a way to get through the emails quickly, try sorting by Sender Name first: that way, you can batch process most of them.
In general, I'd suggest regularly (ie daily or weekly) scrubbing your email to get rid of everything you don't need to keep. If possible, try to do it each time you check your email, according to the GTD process. That is, check your email once or twice a day, and process the Inbox to empty each time.
That way, if you ever do need anything that you've archived, it's a hell of a lot easier to find.