extern BOOL transport_write_message(address_item *, int, int, int, uschar *,
uschar *, uschar *, uschar *, rewrite_rule *, int);
extern void tree_add_duplicate(uschar *, address_item *);
extern BOOL transport_write_message(address_item *, int, int, int, uschar *,
uschar *, uschar *, uschar *, rewrite_rule *, int);
extern void tree_add_duplicate(uschar *, address_item *);