extern int smtp_handle_acl_fail(int, int, uschar *, uschar *);
extern void smtp_log_no_mail(void);
extern void smtp_message_code(uschar **, int *, uschar **, uschar **, BOOL);
-extern void smtp_proxy_tls(void *, uschar *, size_t, int *, int) NORETURN;
+extern void smtp_proxy_tls(void *, uschar *, size_t, int *, int, const uschar *) NORETURN;
extern BOOL smtp_read_response(void *, uschar *, int, int, int);
extern void *smtp_reset(void *);
extern void smtp_respond(uschar *, int, BOOL, uschar *);