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Linux学习之邮件服务器

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服务器数据库
 
[root@localhost ~]# yum install mysql-server -y
 
[root@localhost ~]# /etc/init.d/mysqld start
 
[root@localhost ~]# mysql_secure_installation 设置密码为 westos
 
[root@localhost ~]# yum install httpd -y
 
[root@localhost ~]# lftp 192.168.0.1
 
lftp 192.168.0.1:/pub/postfix> get extmail-1.2.tar.gz extman-1.1.tar.gz
 
[root@localhost ~]# tar zxf extman-1.1.tar.gz
 
[root@localhost ~]# tar zxf extmail-1.2.tar.gz
 
[root@localhost ~]# cd extman-1.1/docs/
 
[root@localhost docs]# mysql -pwestos < extmail.sql
 
[root@localhost docs]# vim init.sql
 

 

INSERT INTO `mailbox` VALUES (‘postmaster@extmail.org’,’postmaster’,’westos’,”,’PostMaster’,”,’extmail.org/postmaster/Maildir/’,’extmail.org/postmaster’,’104857600S’,’52428800S’,’extmail.org’,1000,1000,’2007-02-14 15:10:04′,’2010-11-08′,1,0,0,0,0,0,0,0,’my question’,’my answer’);
 
INSERT INTO `manager` VALUES (‘root@extmail.org’,’westos’,’admin’,’root’,’Super User’,’my question’,’my answer’,’0′,’2007-02-14 15:10:04′,’2010-11-08′,1);
 

 

[root@localhost docs]# mysql -pwestos < init.sql
 

 

[root@localhost docs]# useradd -u 800 vmail
 
[root@localhost docs]# postconf -e virtual_mailbox_base=/home/vmail/
 
[root@localhost docs]# postconf -e virtual_uid_maps=static:800
 
[root@localhost docs]# postconf -e virtual_gid_maps=static:800
 

 

[root@localhost docs]# cp mysql_virtual_alias_maps.cf mysql_virtual_domains_maps.cf mysql_virtual_mailbox_maps.cf /etc/postfix/
 
[root@localhost postfix]# postconf -e virtual_alias_maps=mysql:/etc/postfix/mysql_virtual_alias_maps.cf
 
[root@localhost postfix]# postconf -e virtual_mailbox_domains=mysql:/etc/postfix/mysql_virtual_domains_maps.cf
 
[root@localhost postfix]# postconf -e virtual_mailbox_maps=mysql:/etc/postfix/mysql_virtual_mailbox_maps.cf
 

 

[root@localhost postfix]# postfix reload
 
[root@localhost postfix]# yum install mailx-12.4-6.el6.x86_64 -y
 

 

[root@localhost postfix]# mail support@extmail.org
 
Subject: test
 
qwertyuiop
 
asdfghjkl
 
EOT
 
[root@localhost postfix]# mailq
 
Mail queue is empty
 
这时候,在 /home/vmail/extmail.org/postmaster/Maildir/new 下会有一封新的邮件
 

 

3 月 30 日 第二天从这里开始
 
[root@localhost docs]# mkdir /var/www/extsuite
 
[root@localhost ~]# mv extman-1.1 /var/www/extsuite/extman
 
[root@localhost ~]# mv extmail-1.2 /var/www/extsuite/extmail
 
[root@localhost ~]# cd /var/www/extsuite/
 
[root@localhost extsuite]# chown vmail.vmail * -R
 

 

[root@localhost extsuite]# cp extmail/webmail.cf.default extmail/webmail.cf
 
[root@localhost extsuite]# cp extman/webman.cf.default extman/webman.cf
 
/etc/httpd/conf/httpd.conf 加入
 
NameVirtualHost *:80
 
<VirtualHost *:80>
 
ServerName mail.extmail.org
 
DocumentRoot /var/www/extsuite/extmail/html/
 
ScriptAlias /extmail/cgi /var/www/extsuite/extmail/cgi
 
Alias /extmail /var/www/extsuite/extmail/html
 
ScriptAlias /extman/cgi /var/www/extsuite/extman/cgi
 
Alias /extman /var/www/extsuite/extman/html
 
SuexecUserGroup vmail vmail
 
</VirtualHost>
 

 

主机名修改为 mail.extmail.org
 
[root@localhost extsuite]# /etc/init.d/httpd restart
 

 

[root@localhost extsuite]# vi extmail/webmail.cf
 
修改配置文件 extmail/webmail.cf
 
SYS_LOG_ON = 0
 
SYS_MAILDIR_BASE = /home/vmail
 
SYS_CRYPT_TYPE = plain
 
SYS_MYSQL_USER = extmail
 
SYS_MYSQL_PASS = extmail

修改配置文件 extman/webman.cf
 
SYS_CAPTCHA_ON = 0
 
SYS_MAILDIR_BASE = /home/vmail
 
SYS_SESS_DIR = /tmp/
 
SYS_CRYPT_TYPE = plain
 
SYS_MYSQL_USER = webman
 
SYS_MYSQL_PASS = webman

[root@localhost extsuite]# yum install perl-CGI -y

客户端 192.168.0.1 做 192.168.0.146 mail.extmail.org 解析
 
访问 mail.extmail.org 用户 uname:postmaster passwd:westos
 
http://mail.extmail.org/extman/cgi/index.cgi 管理员 passwd:westos
 
后台运行,管理员可查看系统信息
 
[root@localhost extsuite]# /var/www/extsuite/extman/daemon/cmdserver &

接下来添加功能
 
1. 打开 LOG 功能记录登录状况
 
修改配置文件 extmail/webmail.cf
 
SYS_LOG_ON = 1

[root@localhost ~]# tar zxf Unix-Syslog-1.1.tar.gz
 
[root@localhost Unix-Syslog-1.1]# perl Makefile.PL
 
Can’t locate ExtUtils/MakeMaker.pm in @INC (@INC contains: /usr/local/lib64/perl5 /usr/local/share/perl5 /usr/lib64/perl5/vendor_perl /usr/share/perl5/vendor_perl /usr/lib64/perl5 /usr/share/perl5 .) at Makefile.PL line 1.
 
BEGIN failed–compilation aborted at Makefile.PL line 1.
 
[root@localhost Unix-Syslog-1.1]# yum install -y perl-ExtUtils-MakeMaker
 
[root@localhost Unix-Syslog-1.1]# yum install make gcc -y
 
[root@localhost Unix-Syslog-1.1]# perl Makefile.PL
 
[root@localhost Unix-Syslog-1.1]# make install
 
[root@localhost ~]# tail -f /var/log/maillog 查看日志

2. 加入验证码防暴力注册
 
修改配置文件 extman/webman.cf
 
SYS_CAPTCHA_ON = 1

[root@localhost ~]# yum localinstall perl-GD-2.45-1.el6.rfx.x86_64.rpm -y

3. 绘制图表查看登录频率等信息
 
[root@localhost ~]# yum install rrdtool-perl-1.3.8-6.el6.x86_64.rpm -y
 
[root@localhost ~]# cp -r /var/www/extsuite/extman/addon/mailgraph_ext/ /usr/local/
 
lftp 192.168.0.1:~> get pub/postfix/File-Tail-0.99.3.tar.gz
 
[root@localhost ~]# tar zxf File-Tail-0.99.3.tar.gz
 
[root@localhost ~]# cd File-Tail-0.99.3
 
[root@localhost File-Tail-0.99.3]# yum install perl-Time-HiRes -y
 
[root@localhost File-Tail-0.99.3]# perl Makefile.PL
 
[root@localhost File-Tail-0.99.3]# make install
 
[root@localhost File-Tail-0.99.3]# /usr/local/mailgraph_ext/mailgraph-init start
 
刷新管理员页面,点击 Graph Log

使用 dovecot 接收邮件
 
[root@mail ~]# yum install dovecot-mysql -y
 
[root@mail conf.d]# vim 10-mail.conf
 
mail_location = maildir:/home/vmail/%d/%n/Maildir
 
first_valid_uid = 800
 

 

[root@mail conf.d]# vim 10-auth.conf
 
#!include auth-system.conf.ext
 
!include auth-sql.conf.ext
 

 

[root@mail conf.d]# cp /usr/share/doc/dovecot-2.0.9/example-config/dovecot-sql.conf.ext /etc/dovecot/
 

 

[root@mail dovecot]# vim dovecot-sql.conf.ext
 
driver = mysql
 
connect = host=localhost dbname=extmail user=extmail password=extmail
 
default_pass_scheme = PLAIN
 
password_query = \
 
  SELECT username, domain, password \
 
  FROM mailbox WHERE username = ‘%u’ AND domain = ‘%d’
 
user_query = SELECT maildir, 800 AS uid, 800 AS gid FROM mailbox WHERE username = ‘%u’
 

 

[root@mail dovecot]# /etc/init.d/dovecot restart
 
[root@mail ~]# yum install telnet* -y
 
[root@mail dovecot]# telnet localhost 110
 
Trying ::1…
 
Connected to localhost.
 
Escape character is ‘^]’.
 
+OK Dovecot ready.
 
user weifang@extmail.org
 
+OK
 
pass weifang
 
+OK Logged in.
 
list
 
+OK 0 messages:
 
.
 

相关阅读:

CentOS 6.4 下 Postfix 邮件服务安装和基本配置 http://www.linuxidc.com/Linux/2013-08/88977.htm

CentOS 5.5 下邮件服务器 Postfix 安装 http://www.linuxidc.com/Linux/2012-05/60010.htm

搭建 Red Hat Enterprise Linux 5.4 的 Postfix 邮件服务器 http://www.linuxidc.com/Linux/2012-12/77167.htm

Linux 下架构安全邮件服务器之 Postfix(认证)http://www.linuxidc.com/Linux/2012-09/70527.htm

使用雷鸟客户端

在客户端安装 thunderbird-17.0.2-1.el6.remi.x86_64

设置账户就好了

服务器

[root@mail ~]# vim /etc/postfix/main.cf

inet_interfaces = all

 

 

为使功能健全,在 /etc/rc.local 添加

[root@localhost File-Tail-0.99.3]# vi /etc/rc.local

/var/www/extsuite/extman/daemon/cmdserver &

/usr/local/mailgraph_ext/mailgraph-init start

[root@localhost ~]# chkconfig httpd on

[root@localhost ~]# chkconfig mysqld on

[root@mail ~]# chkconfig dovecot on

 

第二个周

1、postfix 升级

[root@mail postfix-2.11.0]# /etc/init.d/postfix stop

[root@mail postfix-2.11.0]# yum install -y cyrus-sasl-*

[root@mail postfix-2.11.0]# yum install openssl-devel.x86_64 -y

[root@mail postfix-2.11.0]# yum install mysql-devel.x86_64 -y

[root@mail postfix-2.11.0]# yum install db4-devel-4.7.25-17.el6.x86_64 -y

 

[root@mail postfix-2.11.0]# make tidy

[root@mail postfix-2.11.0]# make -f Makefile.init makefiles ‘CCARGS=-DHAS_MYSQL -I/usr/include/mysql -DUSE_SASL_AUTH -DUSE_CYRUS_SASL -I/usr/include/sasl -DUSE_TLS’ ‘AUXLIBS=-L/usr/lib64/mysql/ -lmysqlclient -lz -lm -L/usr/lib64 -lsasl2 -lssl -lcrypto’

[root@mail postfix-2.11.0]# make upgrade

[root@mail ~]# postconf mail_version

mail_version = 2.11.0 查看版本

[root@mail certs]# postconf -A

cyrus

[root@mail certs]# postconf -a

cyrus

dovecot

带上 mysql

[root@mail certs]# postconf -m

 

 

2、发信身份验证,使用统一密码

[root@mail ~]# yum localinstall -y cyrus-sasl-sql-2.1.23-13.el6.x86_64.rpm 注意版本

yum localinstall cyrus-sasl-sql-2.1.23-13.el6_3.1.x86_64.rpm

 

[root@mail sasl2]# vim /etc/sasl2/smtpd.conf

pwcheck_method: auxprop

auxprop_plugin: sql

mech_list: PLAIN LOGIN CRAM-MD5 DIGEST-MD5 NTLM

sql_engine: mysql

sql_hostnames: 127.0.0.1

sql_user: extmail

sql_passwd: extmail

sql_database: extmail

sql_select: SELECT password FROM mailbox WHERE username = ‘%u@%r’

 

[root@mail sasl2]# postconf -e smtpd_sasl_auth_enable=yes

[root@mail sasl2]# postfix reload

 

[root@mail sasl2]# perl -MMIME::Base64 -e ‘print encode_base64(“\0weifang\@extmail.org\0weifang”);’

AHdlaWZhbmdAZXh0bWFpbC5vcmcAd2VpZmFuZw==

[root@mail sasl2]# telnet localhost 25

ehlo mail.extmail.org

auth plain AHdlaWZhbmdAZXh0bWFpbC5vcmcAd2VpZmFuZw==

 

使用雷鸟 outgoing server

编辑

connection none

authentication password,transmitted insecurely

username weifang@extmail.org

之后,用户 weifang@extmail.org 发送邮件就会进行身份验证

登录需要身份验证,发信也需要验证身份,防止身份伪造或者非邮箱本人发信

3、加密发送

[root@mail sasl2]# postconf -e smtpd_tls_auth_only=yes

[root@mail sasl2]# postfix reload

[root@mail sasl2]# telnet localhost 25

ehlo localhost

没有这个 250-AUTH LOGIN CRAM-MD5 DIGEST-MD5 PLAIN

改成 no,就会有 250-AUTH LOGIN CRAM-MD5 DIGEST-MD5 PLAIN

 

[root@mail certs]# postconf -e smtpd_tls_auth_only=no

[root@mail sasl2]# postconf -e smtpd_tls_security_level=may 可以不加密发送

就会多一条这个,表示开启 TLS 加密

250-STARTTLS

 

生成加密验证文件

[root@mail sasl2]# cd /etc/pki/tls/certs/

[root@mail certs]# make postfix.pem

Country Name (2 letter code) [XX]:CN

State or Province Name (full name) []:shaanxi

Locality Name (eg, city) [Default City]:xi’an

Organization Name (eg, company) [Default Company Ltd]:westos

Organizational Unit Name (eg, section) []:LINUX

Common Name (eg, your name or your server’s hostname) []:mail.extmail.org

Email Address []:root@example.com

 

[root@mail certs]# cp postfix.pem /etc/postfix/

[root@mail certs]# postconf -d | grep ^smtpd_tls

[root@mail certs]# postconf -e smtpd_tls_cert_file=/etc/postfix/postfix.pem

[root@mail certs]# postconf -e ‘smtpd_tls_session_cache_database = btree:/var/lib/postfix/smtpd_scache’

 

[root@mail certs]# postconf - n 加上这四条

smtpd_tls_auth_only = no

smtpd_tls_cert_file = /etc/postfix/postfix.pem

smtpd_tls_security_level = may

smtpd_tls_session_cache_database = btree:/var/lib/postfix/smtpd_scache

这时,雷鸟设置 outgoing 为

连接加密 connection STARTTLS 使用加密或者 none 不使用加密都可以正常发送

认证方法 authentication normal password

用户信息 username weifang@extmail.org

weifang 发送邮件的话,需要确认网络环境安全,并得到验证文件,可以发送

修改为强制加密

[root@mail certs]# postconf -e smtpd_tls_security_level=encrypt

[root@mail certs]# postconf -e smtpd_tls_auth_only=yes

[root@mail certs]# postfix reload

如果不使用加密,就不能发送,这样就保证了安全

连接加密 connection STARTTLS 使用加密

认证方法 authentication normal password

用户信息 username weifang@extmail.org

服务器数据库
 
[root@localhost ~]# yum install mysql-server -y
 
[root@localhost ~]# /etc/init.d/mysqld start
 
[root@localhost ~]# mysql_secure_installation 设置密码为 westos
 
[root@localhost ~]# yum install httpd -y
 
[root@localhost ~]# lftp 192.168.0.1
 
lftp 192.168.0.1:/pub/postfix> get extmail-1.2.tar.gz extman-1.1.tar.gz
 
[root@localhost ~]# tar zxf extman-1.1.tar.gz
 
[root@localhost ~]# tar zxf extmail-1.2.tar.gz
 
[root@localhost ~]# cd extman-1.1/docs/
 
[root@localhost docs]# mysql -pwestos < extmail.sql
 
[root@localhost docs]# vim init.sql
 

 

INSERT INTO `mailbox` VALUES (‘postmaster@extmail.org’,’postmaster’,’westos’,”,’PostMaster’,”,’extmail.org/postmaster/Maildir/’,’extmail.org/postmaster’,’104857600S’,’52428800S’,’extmail.org’,1000,1000,’2007-02-14 15:10:04′,’2010-11-08′,1,0,0,0,0,0,0,0,’my question’,’my answer’);
 
INSERT INTO `manager` VALUES (‘root@extmail.org’,’westos’,’admin’,’root’,’Super User’,’my question’,’my answer’,’0′,’2007-02-14 15:10:04′,’2010-11-08′,1);
 

 

[root@localhost docs]# mysql -pwestos < init.sql
 

 

[root@localhost docs]# useradd -u 800 vmail
 
[root@localhost docs]# postconf -e virtual_mailbox_base=/home/vmail/
 
[root@localhost docs]# postconf -e virtual_uid_maps=static:800
 
[root@localhost docs]# postconf -e virtual_gid_maps=static:800
 

 

[root@localhost docs]# cp mysql_virtual_alias_maps.cf mysql_virtual_domains_maps.cf mysql_virtual_mailbox_maps.cf /etc/postfix/
 
[root@localhost postfix]# postconf -e virtual_alias_maps=mysql:/etc/postfix/mysql_virtual_alias_maps.cf
 
[root@localhost postfix]# postconf -e virtual_mailbox_domains=mysql:/etc/postfix/mysql_virtual_domains_maps.cf
 
[root@localhost postfix]# postconf -e virtual_mailbox_maps=mysql:/etc/postfix/mysql_virtual_mailbox_maps.cf
 

 

[root@localhost postfix]# postfix reload
 
[root@localhost postfix]# yum install mailx-12.4-6.el6.x86_64 -y
 

 

[root@localhost postfix]# mail support@extmail.org
 
Subject: test
 
qwertyuiop
 
asdfghjkl
 
EOT
 
[root@localhost postfix]# mailq
 
Mail queue is empty
 
这时候,在 /home/vmail/extmail.org/postmaster/Maildir/new 下会有一封新的邮件
 

 

3 月 30 日 第二天从这里开始
 
[root@localhost docs]# mkdir /var/www/extsuite
 
[root@localhost ~]# mv extman-1.1 /var/www/extsuite/extman
 
[root@localhost ~]# mv extmail-1.2 /var/www/extsuite/extmail
 
[root@localhost ~]# cd /var/www/extsuite/
 
[root@localhost extsuite]# chown vmail.vmail * -R
 

 

[root@localhost extsuite]# cp extmail/webmail.cf.default extmail/webmail.cf
 
[root@localhost extsuite]# cp extman/webman.cf.default extman/webman.cf
 
/etc/httpd/conf/httpd.conf 加入
 
NameVirtualHost *:80
 
<VirtualHost *:80>
 
ServerName mail.extmail.org
 
DocumentRoot /var/www/extsuite/extmail/html/
 
ScriptAlias /extmail/cgi /var/www/extsuite/extmail/cgi
 
Alias /extmail /var/www/extsuite/extmail/html
 
ScriptAlias /extman/cgi /var/www/extsuite/extman/cgi
 
Alias /extman /var/www/extsuite/extman/html
 
SuexecUserGroup vmail vmail
 
</VirtualHost>
 

 

主机名修改为 mail.extmail.org
 
[root@localhost extsuite]# /etc/init.d/httpd restart
 

 

[root@localhost extsuite]# vi extmail/webmail.cf
 
修改配置文件 extmail/webmail.cf
 
SYS_LOG_ON = 0
 
SYS_MAILDIR_BASE = /home/vmail
 
SYS_CRYPT_TYPE = plain
 
SYS_MYSQL_USER = extmail
 
SYS_MYSQL_PASS = extmail

修改配置文件 extman/webman.cf
 
SYS_CAPTCHA_ON = 0
 
SYS_MAILDIR_BASE = /home/vmail
 
SYS_SESS_DIR = /tmp/
 
SYS_CRYPT_TYPE = plain
 
SYS_MYSQL_USER = webman
 
SYS_MYSQL_PASS = webman

[root@localhost extsuite]# yum install perl-CGI -y

客户端 192.168.0.1 做 192.168.0.146 mail.extmail.org 解析
 
访问 mail.extmail.org 用户 uname:postmaster passwd:westos
 
http://mail.extmail.org/extman/cgi/index.cgi 管理员 passwd:westos
 
后台运行,管理员可查看系统信息
 
[root@localhost extsuite]# /var/www/extsuite/extman/daemon/cmdserver &

接下来添加功能
 
1. 打开 LOG 功能记录登录状况
 
修改配置文件 extmail/webmail.cf
 
SYS_LOG_ON = 1

[root@localhost ~]# tar zxf Unix-Syslog-1.1.tar.gz
 
[root@localhost Unix-Syslog-1.1]# perl Makefile.PL
 
Can’t locate ExtUtils/MakeMaker.pm in @INC (@INC contains: /usr/local/lib64/perl5 /usr/local/share/perl5 /usr/lib64/perl5/vendor_perl /usr/share/perl5/vendor_perl /usr/lib64/perl5 /usr/share/perl5 .) at Makefile.PL line 1.
 
BEGIN failed–compilation aborted at Makefile.PL line 1.
 
[root@localhost Unix-Syslog-1.1]# yum install -y perl-ExtUtils-MakeMaker
 
[root@localhost Unix-Syslog-1.1]# yum install make gcc -y
 
[root@localhost Unix-Syslog-1.1]# perl Makefile.PL
 
[root@localhost Unix-Syslog-1.1]# make install
 
[root@localhost ~]# tail -f /var/log/maillog 查看日志

2. 加入验证码防暴力注册
 
修改配置文件 extman/webman.cf
 
SYS_CAPTCHA_ON = 1

[root@localhost ~]# yum localinstall perl-GD-2.45-1.el6.rfx.x86_64.rpm -y

3. 绘制图表查看登录频率等信息
 
[root@localhost ~]# yum install rrdtool-perl-1.3.8-6.el6.x86_64.rpm -y
 
[root@localhost ~]# cp -r /var/www/extsuite/extman/addon/mailgraph_ext/ /usr/local/
 
lftp 192.168.0.1:~> get pub/postfix/File-Tail-0.99.3.tar.gz
 
[root@localhost ~]# tar zxf File-Tail-0.99.3.tar.gz
 
[root@localhost ~]# cd File-Tail-0.99.3
 
[root@localhost File-Tail-0.99.3]# yum install perl-Time-HiRes -y
 
[root@localhost File-Tail-0.99.3]# perl Makefile.PL
 
[root@localhost File-Tail-0.99.3]# make install
 
[root@localhost File-Tail-0.99.3]# /usr/local/mailgraph_ext/mailgraph-init start
 
刷新管理员页面,点击 Graph Log

使用 dovecot 接收邮件
 
[root@mail ~]# yum install dovecot-mysql -y
 
[root@mail conf.d]# vim 10-mail.conf
 
mail_location = maildir:/home/vmail/%d/%n/Maildir
 
first_valid_uid = 800
 

 

[root@mail conf.d]# vim 10-auth.conf
 
#!include auth-system.conf.ext
 
!include auth-sql.conf.ext
 

 

[root@mail conf.d]# cp /usr/share/doc/dovecot-2.0.9/example-config/dovecot-sql.conf.ext /etc/dovecot/
 

 

[root@mail dovecot]# vim dovecot-sql.conf.ext
 
driver = mysql
 
connect = host=localhost dbname=extmail user=extmail password=extmail
 
default_pass_scheme = PLAIN
 
password_query = \
 
  SELECT username, domain, password \
 
  FROM mailbox WHERE username = ‘%u’ AND domain = ‘%d’
 
user_query = SELECT maildir, 800 AS uid, 800 AS gid FROM mailbox WHERE username = ‘%u’
 

 

[root@mail dovecot]# /etc/init.d/dovecot restart
 
[root@mail ~]# yum install telnet* -y
 
[root@mail dovecot]# telnet localhost 110
 
Trying ::1…
 
Connected to localhost.
 
Escape character is ‘^]’.
 
+OK Dovecot ready.
 
user weifang@extmail.org
 
+OK
 
pass weifang
 
+OK Logged in.
 
list
 
+OK 0 messages:
 
.
 

相关阅读:

CentOS 6.4 下 Postfix 邮件服务安装和基本配置 http://www.linuxidc.com/Linux/2013-08/88977.htm

CentOS 5.5 下邮件服务器 Postfix 安装 http://www.linuxidc.com/Linux/2012-05/60010.htm

搭建 Red Hat Enterprise Linux 5.4 的 Postfix 邮件服务器 http://www.linuxidc.com/Linux/2012-12/77167.htm

Linux 下架构安全邮件服务器之 Postfix(认证)http://www.linuxidc.com/Linux/2012-09/70527.htm

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