diff -up exim-4.63/src/deliver.c.doneunique exim-4.63/src/deliver.c
--- exim-4.63/src/deliver.c.doneunique	2006-07-31 16:19:48.000000000 +0200
+++ exim-4.63/src/deliver.c	2010-06-28 16:46:16.000000000 +0200
@@ -624,7 +624,7 @@ for (dup = addr_duplicate; dup != NULL; 
   {
   if (Ustrcmp(addr->unique, dup->unique) == 0)
     {
-    tree_add_nonrecipient(dup->address);
+    tree_add_nonrecipient(dup->unique);
     child_done(dup, now);
     }
   }