How do I stop all the freecycle emails?

If you're receiving emails from Yahoo Groups (and 99% of people who ask this question are), you should switch to trash nothing! to use your existing freecycle groups so that you won't be flooded with emails. Just join your local freecycle groups through trash nothing! and unsubscribe from your groups on Yahoo Groups.

Alternatively, if you've decided you want to give up on the whole reuse and free stuff idea, you can just unsubscribe from your groups on Yahoo Groups

For the 1% who aren't receiving emails from Yahoo Groups, you can change your email preferences on the Email Alerts & Daily Digest tab of your Profile page.