Unfilterable emails from Twitter

  A few weeks ago Twitter started sending emails saying so-and-so has tweets for you. Problem is, I've created an enormous number of Twitter accounts over the years, most of which are long-forgotten, that follow no one. So presumably their robots have no way of knowing what this non-existent entity likes. So I get the dregs.
  Here's an example.
  There is no news there that I am remotely interested in.
  News about super celebs, TV stars, famous athletes. Mostly grunts and snorts and news that I've already read.
  Normally I'd just create a filter and map it to the trash, and that would be that.
  But they haven't put any identitying info on the email that makes it filterable.
  Ooops.
  PS: My solution for now is to click the Spam button in GMail, training it, I hope, to view these messages as unwelcome advertising.