#define topt_no_body 0x040 /* Omit body */
#define topt_escape_headers 0x080 /* Apply escape check to headers */
#define topt_use_bdat 0x100 /* prepend chunks with RFC3030 BDAT header */
+#define topt_output_string 0x200 /* create string rather than write to fd */
+#define topt_continuation 0x400 /* do not reset buffer */
/* Options for smtp_write_command */