-uschar *deliver_localpart_orig = NULL;
-uschar *deliver_localpart_parent = NULL;
-uschar *deliver_localpart_prefix = NULL;
-uschar *deliver_localpart_prefix_v = NULL;
-uschar *deliver_localpart_suffix = NULL;
-uschar *deliver_localpart_suffix_v = NULL;
+const uschar *deliver_localpart_orig = NULL;
+const uschar *deliver_localpart_parent = NULL;
+const uschar *deliver_localpart_prefix = NULL;
+const uschar *deliver_localpart_prefix_v = NULL;
+const uschar *deliver_localpart_suffix = NULL;
+const uschar *deliver_localpart_suffix_v = NULL;