extern BOOL smtp_start_session(void);
extern int smtp_ungetc(int);
extern BOOL smtp_verify_helo(void);
-extern int smtp_write_command(smtp_outblock *, BOOL, const char *, ...) PRINTF_FUNCTION(3,4);
+extern int smtp_write_command(smtp_outblock *, int, const char *, ...) PRINTF_FUNCTION(3,4);
#ifdef WITH_CONTENT_SCAN
extern int spam(const uschar **);
extern FILE *spool_mbox(unsigned long *, const uschar *, uschar **);