Tomorrow (December 31st) the old return email address we've been using for years will die. There is a new email address which the newsletter puts in automatically for replies. No need to resubscribe or anything, however should you try to reply to the most recent newsletter after the 31st, I won't get it.
However, for each new person you get to subscribe to the Webmansion Newsletter, we will reduce the annual cost of your subscription by 10%! Very exciting news.