extern BOOL smtp_buffered(void);
extern void smtp_closedown(uschar *);
extern int smtp_connect(host_item *, int, int, uschar *, int, BOOL, const uschar *
extern BOOL smtp_buffered(void);
extern void smtp_closedown(uschar *);
extern int smtp_connect(host_item *, int, int, uschar *, int, BOOL, const uschar *