The original message was received at Tue, 16 Oct 2007 01:24:31 -0400 (EDT)
from root@localhost
----- The following addresses had permanent fatal errors ----- test@sina.com
(reason: 550 5.1.1 <test@sina.com>... User unknown)
(expanded from: test@sina.com)
----- Transcript of session follows -----
... while talking to [127.0.0.1]:
>>> DATA
<<< 550 5.1.1 <test@sina.com>... User unknown
550 5.1.1 test@sina.com... User unknown
<<< 503 5.0.0 Need RCPT (recipient)