--- em-junk-filter.c.orig	2008-11-09 16:19:48.904929658 +0100
+++ em-junk-filter.c	2008-11-09 16:23:47.244998507 +0100
@@ -250,7 +250,7 @@
 		else
 			res = rv_err;
 
-		if (res != 0)
+		if (res >= 64)		/* spamc and spamassassin use error codes of 64 and above to denote execution errors */
 			g_set_error (error, EM_JUNK_ERROR, res, _("Pipe to SpamAssassin failed, error code: %d"), res);
 
 		return res;