+#ifdef EXPERIMENTAL_DOMAINKEYS
+extern BOOL dk_transport_write_message(address_item *, int, int,
+ int, uschar *, uschar *, uschar *, uschar *, rewrite_rule *,
+ int, uschar *, uschar *, uschar *, uschar *, uschar *, uschar *);
+#endif
+#ifdef EXPERIMENTAL_DKIM
+extern BOOL dkim_transport_write_message(address_item *, int, int,
+ int, uschar *, uschar *, uschar *, uschar *, rewrite_rule *,
+ int, uschar *, uschar *, uschar *, uschar *, uschar *, uschar *);
+#endif