diff -urN ../Mail-SpamAssassin-3.4.1.orig/lib/Mail/SpamAssassin/PerMsgStatus.pm ./lib/Mail/SpamAssassin/PerMsgStatus.pm
--- ../Mail-SpamAssassin-3.4.1.orig/lib/Mail/SpamAssassin/PerMsgStatus.pm	2015-05-13 20:56:28.000000000 +0300
+++ ./lib/Mail/SpamAssassin/PerMsgStatus.pm	2015-10-25 14:08:23.000000000 +0200
@@ -3163,7 +3163,11 @@
 
   #loop through and limit to just the domain with a dummy address
   for (my $i = 0; $i < scalar(@addrs); $i++) {
-    $addrs[$i] = 'dummy@'.$self->{main}->{registryboundaries}->uri_to_domain($addrs[$i]);
+    if ($self->{main}->{registryboundaries}->uri_to_domain($addrs[$i])) {
+      $addrs[$i] = 'dummy@'.$self->{main}->{registryboundaries}->uri_to_domain($addrs[$i]);
+    } else {
+      $addrs[$i] = '';
+    }
   }
 
   #Remove duplicate domains