Watch the episode where Fi found a review of one of Molly's shows that hadn't happened yet. Watch the part of that episode where Fi is supposed to be studying, but she decides to get online instead. When Fi's new email's first come up (but she doesn't see them) look at the email above the email from "Unknown". It says "To web master". Now watch when Fi does look at her new email's, the email above the email from "Unknown" says "To Jack".