OK, I figured it out.  It happens when someone uses Yahoo! Mail to send 
something to Yahoo! Groups.  The "received" for Yahoo! Groups looks like:

> Received: from [216.115.97.190] by n22.groups.yahoo.com with NNFMP; 02 Mar
> 2002 03:35:46 -0000

Here's a patch that should recognize this.

Index: lib/Mail/SpamAssassin/EvalTests.pm
===================================================================
RCS file: 
/cvsroot/spamassassin/spamassassin/lib/Mail/SpamAssassin/EvalTests.pm,v
retrieving revision 1.106
diff -u -3 -p -r1.106 EvalTests.pm
--- lib/Mail/SpamAssassin/EvalTests.pm  20 Feb 2002 03:13:20 -0000      1.106
+++ lib/Mail/SpamAssassin/EvalTests.pm  2 Mar 2002 09:04:14 -0000
@@ -207,6 +207,10 @@ sub check_for_forged_yahoo_received_head
 
   if ($rcvd =~ /by web\S+\.mail\.yahoo\.com via HTTP/) { return 0; }
   if ($rcvd =~ /by smtp\.\S+\.yahoo\.com with SMTP/) { return 0; }
+  if ($rcvd =~
+      /from [\d+\.\d+\.\d+\.\d+] by \S+\.groups.yahoo.com with NNFMP/) {
+    return 0;
+  }
 
   return 1;
 }

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