extern void transport_update_waiting(host_item *, uschar *);
extern BOOL transport_write_block(transport_ctx *, uschar *, int, BOOL);
extern void transport_write_reset(int);
extern void transport_update_waiting(host_item *, uschar *);
extern BOOL transport_write_block(transport_ctx *, uschar *, int, BOOL);
extern void transport_write_reset(int);