You can remove a certain email address from your marketing lists by going to Settings > Email Campaigns (about 1/3 of the way down the center column), and then choosing the third step - Upload Unsubscribed Email Address(es).
Simply enter the email you wish to unsubscribe in the Email Address box to the right and click the 'Unsubscribe Email Address' button to add that address to the unsubscribed list (or do not solicit list).
All email addresses on the unsubscribed list will be blocked from marketing emails sent through the Email Campaign system, but will still get transactional emails such as order confirmations.
Remove Email Addresses
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