+ uschar *authenticator; /* auth driver name used by transport */
+ uschar *auth_id; /* auth "login" name used by transport */
+ uschar *auth_sndr; /* AUTH arg to SMTP MAIL, used by transport */
+
+ uschar *dsn_orcpt; /* DSN orcpt value */
+ int dsn_flags; /* DSN flags */
+ int dsn_aware; /* DSN aware flag */
+