Third link down under Design in your control panel. The last paragraph of this tip describes what to do there to make the avatars in emails that are sent out match the site.
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When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .