extern BOOL expand_check_condition(uschar *, uschar *, uschar *);
extern uschar *expand_string(uschar *);
extern uschar *expand_string_copy(uschar *);
extern BOOL expand_check_condition(uschar *, uschar *, uschar *);
extern uschar *expand_string(uschar *);
extern uschar *expand_string_copy(uschar *);
extern int filter_interpret(uschar *, int, address_item **, uschar **);
extern BOOL filter_personal(string_item *, BOOL);
extern int filter_interpret(uschar *, int, address_item **, uschar **);
extern BOOL filter_personal(string_item *, BOOL);