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大家好，我用centos 6.3+postfix 2.6+dovecot 2 搭了个邮件服务器想研究研究。可以我的服务器不用smtp认证就能发信，我想开启smtp认证。我是按dovecot官网上配置的，但是没有成功，感觉在发信的时候根本就没有进行认证这个动作，请问是不是还要配置别的地方，才能开始认证呢。请好心人帮我看看，万分感谢，我的配置如下
main.cf
alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
broken_sasl_auth_clients = yes
command_directory = /usr/sbin
config_directory = /etc/postfix
daemon_directory = /usr/libexec/postfix
data_directory = /var/lib/postfix
debug_peer_level = 2
home_mailbox = Maildir/
html_directory = no
inet_interfaces = all
inet_protocols = all
mail_owner = postfix
mailq_path = /usr/bin/mailq.postfix
manpage_directory = /usr/share/man
mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain
mydomain = test.com
myhostname = mail.test.com
mynetworks = 127.0.0.0/8, 192.168.1.0/24
mynetworks_style = subnet
myorigin = $mydomain
newaliases_path = /usr/bin/newaliases.postfix
queue_directory = /var/spool/postfix
readme_directory = /usr/share/doc/postfix-2.6.6/README_FILES
sample_directory = /usr/share/doc/postfix-2.6.6/samples
sendmail_path = /usr/sbin/sendmail.postfix
setgid_group = postdrop
smtpd_client_restrictions = permit_sasl_authenticated
smtpd_sasl_auth_enable = yes
smtpd_sasl_path = private/auth
smtpd_sasl_type = dovecot
unknown_local_recipient_reject_code = 550

在dovecot 的 10-master.conf里 加入了如下内容

service auth {
...
  unix_listener /var/spool/postfix/private/auth {
    mode = 0660
    # Assuming the default Postfix user and group
    user = postfix
    group = postfix       
  }
  ...
}