Another thing that can happen… Akismet moves comments (spam and occasional false-positives) to the Spam folder where they accumulate for review before final deletion and feedback to the remote database. The Spam folder is displayed twenty comments to a page. If there is more than one page, a new false-positive can arrive on Page 1 while a moderator is reviewing Page 2 or greater. If the moderator doesn’t notice the running total increase and clicks the “Empty Spam” button on reaching the end of the list, the false-positive gets deleted along with the real spam, and its originating e-mail address gets tagged. Better to review the Spam folder in reverse order, mods please note.