--- a/log.pl	Tue Aug 28 09:13:24 2012 +0200
+++ b/log.pl	Tue Aug 28 09:17:37 2012 +0200
@@ -301,8 +301,7 @@
 }
 
 sub mailto() {
-    return join(", ", @config::mailto) if @config::mailto;
-    return "";
+    return join(", ", grep defined => @config::mailto);
 }
 
 sub word_encoded($) {