Lỗi 530 5.7.1 Client was not authenticated khi gửi e-mail tới Exchange server

Do default setting của Exchange Server không cho phép kết nối anonymous access do vậy khi gửi e-mail từ bên ngoài tới Exchange Server sẽ gặp thông báo lỗi sau
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Delivery to the following recipient failed permanently:

    xyz@abc.com

Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the recipient domain. We recommend contacting the other email provider for further information about the cause of this error. The error that the other server returned was: 530 530 5.7.1 Client was not authenticated (state 13).

----- Original message -----

MIME-Version: 1.0
Received: by xx.xx.xx.xx with SMTP id f6mr465398icm.48.1315626824576; Fri, 09
 Sep 2011 20:53:44 -0700 (PDT)
Received: by xx.xx.xxx.xxx with HTTP; Fri, 9 Sep 2011 20:53:44 -0700 (PDT)
Date: Sat, 10 Sep 2011 10:53:44 +0700
Message-ID:
Subject: test
From: xxx
To: xxx
Content-Type: multipart/alternative; boundary=90e6ba614fac892f6204ac8e3d13
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Để cho phép gửi e-mail từ bên ngoài tới Exchange Server của công ty bạn, cần cho phép anonymous aceess
Trong EMC -> Server configuration -> add new receive connector -> chọn connection type là internet -> trong tab “permission Groups” chọn “Anonymous users” click apply and ok.
Link tham khảo: http://smtp25.blogspot.com/2009/04/530-571-client-was-not-authenticated.html