+#if (defined EXPERIMENTAL_DOMAINKEYS) || (defined 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 *,
+ uschar *, uschar *, uschar *, uschar *, uschar *, uschar *
+ );
+#endif