Smart(er) people: spam email blockers?

[scott in nashville]

I have 3 or 4 email addresses that I use, and one is really old (yahoo.com anyone?). That one in particular just gets filled with spam. It would be a full time job to unsubscribe to all of the sh!t I get, but I do actually still need that address from time to time.

Any of you smart guys have a solution that you use? I use the mail function on my Mac to consolidate all of the mailboxes into one spot in case you're wondering what mail program I'm using.