--- a/log.pl	Tue Aug 28 09:06:35 2012 +0200
+++ b/log.pl	Tue Aug 28 09:11:40 2012 +0200
@@ -301,7 +301,8 @@
 }
 
 sub mailto() {
-    return join(", ", @config::mailto);
+    return join(", ", @config::mailto) if @config::mailto;
+    return "";
 }
 
 sub word_encoded($) {