【求助】邮件认证使用sendmail出错

lsdir

我用的是discuz的论坛，现在想使用会员通过邮件认证进行注册。根据官方的文档，这个功能是通过php函数和sendmail完成的。我使用的是AS4，默认安装的sendmail。当开启这个功能以后，发现不能进行正常的邮件认证。用文件测试一下，系统给我回复mail内容如下：

1. 
   
2. 
   
3. From MAILER-DAEMON@localhost.localdomain  Fri Jul 21 14:33:42 2006
   
4. Return-Path: <MAILER-DAEMON@localhost.localdomain>
   
5. Received: from localhost.localdomain (bbsserver [127.0.0.1])
   
6.         by localhost.localdomain (8.13.1/8.13.1) with ESMTP id k6L6Xgb9003177
   
7.         for <nobody@localhost.localdomain>; Fri, 21 Jul 2006 14:33:42 +0800
   
8. Received: from localhost (localhost)
   
9.         by localhost.localdomain (8.13.1/8.13.1/Submit) id k6L6XfRV003176;
   
10.         Fri, 21 Jul 2006 14:33:42 +0800
    
11. Date: Fri, 21 Jul 2006 14:33:42 +0800
    
12. From: Mail Delivery Subsystem <MAILER-DAEMON@localhost.localdomain>
    
13. Message-Id: <200607210633.k6L6XfRV003176@localhost.localdomain>
    
14. To: nobody@localhost.localdomain
    
15. MIME-Version: 1.0
    
16. Content-Type: multipart/report; report-type=delivery-status;
    
17.         boundary="k6L6XfRV003176.1153463622/localhost.localdomain"
    
18. Content-Transfer-Encoding: 8bit
    
19. Subject: Returned mail: see transcript for details
    
20. Auto-Submitted: auto-generated (failure)
    
21. 
    
22. This is a MIME-encapsulated message
    
23. 
    
24. --k6L6XfRV003176.1153463622/localhost.localdomain
    
25. 
    
26. The original message was received at Fri, 21 Jul 2006 14:33:41 +0800
    
27. from nobody@localhost
    
28. 
    
29.    ----- The following addresses had permanent fatal errors -----
    
30. Discuz! User <me@localhost>
    
31.     (reason: 550 5.1.1 <me@localhost.localdomain>... User unknown)
    
32.     (expanded from: Discuz! User <me@localhost>)
    
33. 
    
34.    ----- Transcript of session follows -----
    
35. ... while talking to [127.0.0.1]:
    
36. >>> DATA
    
37. <<< 550 5.1.1 <me@localhost.localdomain>... User unknown
    
38. 550 5.1.1 Discuz! User <me@localhost>... User unknown
    
39. 
    
40. --k6L6XfRV003176.1153463622/localhost.localdomain
    
41. Content-Type: message/delivery-status
    
42. 
    
43. Reporting-MTA: dns; localhost.localdomain
    
44. Arrival-Date: Fri, 21 Jul 2006 14:33:41 +0800
    
45. 
    
46. Final-Recipient: RFC822; Discuz! User <me@localhost>
    
47. X-Actual-Recipient: RFC822; me@localhost.localdomain
    
48. Action: failed
    
49. Status: 5.1.1
    
50. Remote-MTA: DNS; [127.0.0.1]
    
51. Diagnostic-Code: SMTP; 550 5.1.1 <me@localhost.localdomain>... User unknown
    
52. Last-Attempt-Date: Fri, 21 Jul 2006 14:33:42 +0800
    
53. 
    
54. --k6L6XfRV003176.1153463622/localhost.localdomain
    
55. Content-Type: message/rfc822
    
56. Content-Transfer-Encoding: 8bit
    
57. 
    
58. Return-Path: <nobody>
    
59. Received: (from nobody@localhost)
    
60.         by localhost.localdomain (8.13.1/8.13.1/Submit) id k6L6XfRU003176;
    
61.         Fri, 21 Jul 2006 14:33:41 +0800
    
62. Date: Fri, 21 Jul 2006 14:33:41 +0800
    
63. Message-Id: <200607210633.k6L6XfRU003176@localhost.localdomain>
    
64. To: Discuz! User <me@localhost.localdomain>
    
65. Subject: 标准方式发送 Email(群发)
    
66. From: zenbin@21cn.com
    
67. 
    
68. 通过 PHP 函数及 UNIX sendmail 发送
    
69. 
    
70. 群体发送邮件发送至 lsdir@163.com, lsblog2000@yahoo.com.cn
    
71. 
    
72. 来自 zenbin@21cn.com
    
73. 
    
74. --k6L6XfRV003176.1153463622/localhost.localdomain--
    

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请问各位大大，这个sendmail的问题可能出现在什么地方？