SMTP认证不通过

sm34oj

大家帮我看下这是什么原因，安装邮件服务器出现的：

[root@localhost ~]# telnet 127.0.0.1 25
Trying 127.0.0.1...
Connected to localhost.localdomain (127.0.0.1).
Escape character is '^]'.
220 localhost.localdomain ESMTP Postfix
auth login
334 VXNlcm5hbWU6
bGk=
334 UGFzc3dvcmQ6
MTIzNDU2
535 5.7.8 Error: authentication failed: authentication failure
quit
221 2.0.0 Bye
Connection closed by foreign host.


maillog 如下:
Dec  3 18:38:51 localhost postfix/master[10643]: terminating on signal 15
Dec  3 18:39:02 localhost postfix/postfix-script[11110]: the Postfix mail system is not running
Dec  3 18:39:12 localhost postfix/postfix-script[11160]: starting the Postfix mail system
Dec  3 18:39:12 localhost postfix/master[11161]: daemon started -- version 2.5.17, configuration /etc/postfix
Dec  3 18:40:33 localhost postfix/smtpd[11194]: warning: dict_nis_init: NIS domain name not set - NIS lookups disabled
Dec  3 18:40:33 localhost postfix/smtpd[11194]: connect from localhost.localdomain[127.0.0.1]
Dec  3 18:43:10 localhost postfix/smtpd[11194]: warning: SASL authentication problem: unable to open Berkeley db /etc/sasldb2: No such file or directory
Dec  3 18:43:10 localhost postfix/smtpd[11194]: warning: SASL authentication problem: unable to open Berkeley db /etc/sasldb2: No such file or directory
Dec  3 18:43:10 localhost postfix/smtpd[11194]: warning: localhost.localdomain[127.0.0.1]: SASL login authentication failed: authentication failure
Dec  3 18:43:14 localhost postfix/smtpd[11194]: disconnect from localhost.localdomain[127.0.0.1]