-static uschar *smtp_command; /* Points to last cmd for error messages */
-static uschar *mail_command; /* Points to MAIL cmd for error messages */
-static BOOL update_waiting; /* TRUE to update the "wait" database */
-static BOOL pipelining_active; /* current transaction is in pipe mode */
+static uschar *smtp_command; /* Points to last cmd for error messages */
+static uschar *mail_command; /* Points to MAIL cmd for error messages */
+static uschar *data_command = US""; /* Points to DATA cmd for error messages */
+static BOOL update_waiting; /* TRUE to update the "wait" database */
+static BOOL pipelining_active; /* current transaction is in pipe mode */