Somebody already answered the question on Blue Bamboo.
Re: emails - I use Outlook and set up a rule that emails from the email address confirming registration go right to my deleted mail.
I enjoy the hop and found that most sites have decent clues so the bunnies are easy to find. Those that don't have clues generally put the bunny on the newsletter page. Several others that don't have clues usually always have the bunny on the same page of the site so I've made notes of those so I don't spend a lot of time. If I can't find the bunny in a reasonable amount of time on a newly participating site - a couple of minutes or less, I leave the shop and come back in a week or so. I'm sure they'll have heard from some frustrated bunny-hunter and add a clue.
If a site doesn't have the current month's colored bunny on the main page, I wait a few days and check later.
Just my thoughts.