Index: rulesrc/sandbox/kb/20_bug_6156.cf
===================================================================
--- rulesrc/sandbox/kb/20_bug_6156.cf	(revision 810669)
+++ rulesrc/sandbox/kb/20_bug_6156.cf	(working copy)
@@ -4,3 +4,7 @@
 tflags   RCVD_IN_PSBL  net
 # score    RCVD_IN_PSBL  0 1.00 0 1.00
 
+# 0.46/month is roughly 2 weeks in an average month
+header RCVD_IN_2WEEKS          eval:received_within_months('0', '0.46')
+describe RCVD_IN_2WEEKS        Received: within the past 2 weeks
+meta RCVD_IN_PSBL_2WEEKS       RCVD_IN_PSBL && RCVD_IN_2WEEKS
Index: lib/Mail/SpamAssassin/Plugin/HeaderEval.pm
===================================================================
--- lib/Mail/SpamAssassin/Plugin/HeaderEval.pm	(revision 810669)
+++ lib/Mail/SpamAssassin/Plugin/HeaderEval.pm	(working copy)
@@ -67,6 +67,7 @@
   $self->register_eval_rule("check_ratware_name_id");
   $self->register_eval_rule("check_ratware_envelope_from");
   $self->register_eval_rule("gated_through_received_hdr_remover");
+  $self->register_eval_rule("received_within_months");
 
   return $self;
 }