extern uschar *errors_reply_to; /* Reply-to for error messages */
extern int errors_sender_rc; /* Return after message to sender*/
-#ifdef EXPERIMENTAL_EVENT
+#ifndef DISABLE_EVENT
extern uschar *event_action; /* expansion for delivery events */
extern uschar *event_data; /* event data */
extern int event_defer_errno; /* error number set when a remote delivery is deferred with a host error */