body NUMEMAIL /\d{3,}\s+emails?/i
describe NUMEMAIL Mail which mentions some number of e-mail addresses
score NUMEMAIL 2
+
+# don 2009-11-25
+header YAHOOCALENDAR X-Yahoo-Calendar-IId: =~ /./
+describe YAHOOOCALENDAR Mail comming from yahoo calendar, which spams us with updates
+score YAHOOCALENDAR 5