I use spamgourmet, these are my most spammed emails:

  id            emails  creation    notes
  =======================================
  freepsp       37177   2005-09-23
  mtgox         21229   2011-06-19
  scriptaculous 10408   2006-03-27
  winex         5103    2007-05-01
  patriciafield 4293    2007-03-09 
  rms           3472    2007-03-10  www.rmsexperts.com
  wallstsense   3310    2009-04-01      
  panda         3300    2004-11-02  panda antivirus

Edited for formatting