extern uschar *string_format_size(int, uschar *);
extern int string_interpret_escape(const uschar **);
extern int string_is_ip_address(const uschar *, int *);
+#ifdef EXPERIMENTAL_INTERNATIONAL
+extern BOOL string_is_utf8(const uschar *);
+#endif
extern uschar *string_log_address(address_item *, BOOL, BOOL);
extern uschar *string_nextinlist(const uschar **, int *, uschar *, int);
extern uschar *string_open_failed(int, const char *, ...) PRINTF_FUNCTION(2,3);
extern const uschar *string_printing2(const uschar *, BOOL);
extern uschar *string_split_message(uschar *);
extern uschar *string_unprinting(uschar *);
+#ifdef EXPERIMENTAL_INTERNATIONAL
+extern uschar *string_domain_alabel_to_utf8(const uschar *, uschar **);
+extern uschar *string_domain_utf8_to_alabel(const uschar *, uschar **);
+extern uschar *string_localpart_alabel_to_utf8(const uschar *, uschar **);
+extern uschar *string_localpart_utf8_to_alabel(const uschar *, uschar **);
+#endif
extern BOOL string_vformat(uschar *, int, const char *, va_list);
extern int strcmpic(const uschar *, const uschar *);
extern int strncmpic(const uschar *, const uschar *, int);