fixed cache handling during address concatenation

+2002-11-25  Frederic Gobry  <frederic.gobry@smartdata.ch>
+
+	* mailbox/address.c (address_concatenate): cleanup the address
+	cache during concatenation.
+
 2002-11-25  Sergey Poznyakoff 
 
 	* mail.local/main.c (deliver): Bugfix: n and isize were not

@@ -171,8 +171,16 @@ address_concatenate (address_t to, address_t * from)
   to->next = *from;
   *from = NULL;
 
+  /* discard the current string cache as it is now inaccurate */
+  if (to->addr)
+    {
+      free (to->addr);
+      to->addr = NULL;
+    }
+
   to = to->next;
 
+  /* only the first address must have a cache */
   if (to->addr)
     {
       free (to->addr);