diff -ruN qmail-1.03-7.08/qmail-smtpd.c qmail-1.03-7.09/qmail-smtpd.c
--- qmail-1.03-7.08/qmail-smtpd.c	2008-12-04 04:07:12.000000000 -0500
+++ qmail-1.03-7.09/qmail-smtpd.c	2010-02-05 10:02:19.000000000 -0500
@@ -793,12 +793,12 @@
   switch(wait_exitcode(wstat)) {
     case 100:
       if (!len) {
-        len = str_copy(rcptcheck_err,"553 no mailbox here by that name");
+        len = str_copy(rcptcheck_err,"553 sorry, no mailbox here by that name. (#5.1.1)\r\n");
         rcptcheck_err[len] = '\0' ;
       }
     case 111:
       if (!len) {
-        len = str_copy(rcptcheck_err,"450 unable to verify recipient");
+        len = str_copy(rcptcheck_err,"421 unable to verify recipient (#4.3.0)\r\n");
         rcptcheck_err[len] = '\0' ;
       }
       return 0;