一、先卸载sendmain
  [root@ser ~]#  yum remove sendmail
二、安装postfix ,dovecot,cyrus-sasl
[root@ser ~]#  yum -y install postfix
[root@ser ~]#  yum -y install dovecot
[root@ser ~]#  yum -y install cyrus-sasl
四、 修改postfix的配置文件
[root@ser ~]# vim /etc/postfix/main.cf

myhostname = mail.yjw.com 
mydomain = yjw.com 
myorigin = yjw.com 
inet_interfaces =all 
mynetworks = 192.168.1.0/24
relay_domains = yjw.com, $mydomain
mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain,       mail.$mydomain, 
www.$mydomain
, 
ftp.$mydomain
重启　postfix 服务

[root@ser ~]# service postfix restart
Shutting down postfix:           [  OK  ]
Starting postfix:            [  OK  ]
[root@ser ~]# chkconfig  postfix on 
[root@ser ~]# chkconfig  dovecot on 
修改dovecot的配置文件
vim /etc/dovecot.conf
protocols = imap imaps  pop3 pop3s
listen = *
在iptables　里开放２５，110，143端口
[root@ser ~]# vim /etc/sysconfig/iptables
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 110 -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 25 -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 143 -j ACCEPT
重启iptables
[root@ser ~]# service iptables restart
Flushing firewall rules:                [  OK  ]
Setting chains to policy ACCEPT: filter     [  OK  ]
Unloading iptables modules:             [  OK 
Applying iptables firewall rules:         [  OK  ]
Loading additional iptables modules: ip_conntrack_netbios_n[  OK  ]ntrack_ftp 
[root@ser ~]# yum -y install cyrus-sasl
[root@ser ~]# chkconfig  saslauthd on
修改 /etc/sysconfig/saslauthd
[root@ser ~]# vim /etc/sysconfig/saslauthd 

# Directory in which to place saslauthd's listening socket, pid file, and so
# on.  This directory must already exist.
SOCKETDIR=/var/run/saslauthd

# Mechanism to use when checking passwords.  Run "saslauthd -v" to get a list
# of which mechanism your installation was compiled with the ablity to use.
MECH=shadow

# Additional flags to pass to saslauthd on the command line.  See saslauthd(8)
# for the list of accepted flags.
FLAGS=
修改 /usr/lib/sasl2/smtpd.conf
[root@ser ~]# vim /usr/lib/sasl2/smtpd.conf
pwcheck_method: saslauthd
测试 saslauthd
[root@ser ~]# service saslauthd  restart
[root@ser ~]# testsaslautd  -u yjw -p '020304'
0: OK "Success."
在postfix 的配置文件中，添加以下内容，使其支持SMTP认证
[root@ser ~]#  vim /etc/postfix/main.cf
message_size_limit = 1073741824   # 邮件的大小为10M
default_process_limit = 50 
default_destination_concurrency_limit = 20

smtpd_sasl_auth_enable = yes
smtpd_sasl_local_domain =  $myhostname

smtpd_sasl_application_name = smtpd

broken_sasl_auth_clients = yes
smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated,
  reject_unauth_destination
smtpd_client_restrictions = permit_sasl_authenticated
smtpd_sasl_security_options = noanonymous
测试 25端口
[root@ser ~]#  telnet mail.yjw.com 25  
Trying 192.168.1.2...
Connected to mail.yjw.com (192.168.1.2).
Escape character is '^]'.
220 mail.yjw.com ESMTP Postfix
EHLO  163.com
250-mail.yjw.com
250-PIPELINING
250-SIZE 10240000
250-VRFY
250-ETRN
250-AUTH LOGIN PLAIN
250-AUTH=LOGIN PLAIN
250-ENHANCEDSTATUSCODES
250-8BITMIME
250 DSN
quit
221 2.0.0 Bye
Connection closed by foreign host.
[root@ser ~]# 
五、安装openwebmail
[root@ser ~]# vim /etc/yum.repos.d/openwebmail.repo  
[openwebmail]
## Thomas Chung 
## 2008.05.29
name=Openwebmail for Fedora or Enterprise Linux
baseurl=http://openwebmail.org/openwebmail/download/redhat/rpm/release/
enabled=1
gpgcheck=1
gpgkey=http://openwebmail.org/openwebmail/download/redhat/rpm/release/RPM-GPG-KEY-openwebmail
#metadata_expire=0
若这样安装不成功，先安装 perl-Text-Iconv-1.4-1.2.el4.rf.i386.rpm
[root@ser ~]#  yum -y  install openwebmail 
[root@ser ~]# cd /var/www/cgi-bin/openwebmail/
[root@ser openwebmail]# ./openwebmail-tool.pl  --init  #出现Y/N时 ，按N.
修改openwebmail 的一些配置文件
[root@ser etc]# vim dbm.conf 
dbm_ext                 .db
dbmopen_ext             .db
dbmopen_haslock         no
[root@ser etc]]# cd defaults/
[root@ser defaults]#  vim dbm.conf 
dbm_ext                 .db
dbmopen_ext             .db
dbmopen_haslock         yes
smtpserver  192.168.1.2
[root@ser defaults]#  vim openwebmail.conf
domainnames             yjw.com
smtpserver              192.168.1.2
authpop3_server         192.168.1.2
再次初始化openwebmail
[root@ser defaults]# cd  ../../openwebmail-tool.pl  --init  
出现Y/N 时，按Y。

把Postfix+Dovecot+Openwebmail 三者个格式统一下就行了
1.postfix 配置 main.cf
mail_spool_directory = /var/spool/mail
2.Dovecot 配置 Dovecot.conf
mail_location = mbox:~/mail:INBOX=/var/spool/mail/%u
3.Openwebmail.conf
mailspooldir /var/spool/mail

六、安装httpd
[root@ser ~]# yum - y install httpd
[root@ser ~]# chkconfig httpd on 
[root@ser ~]# service httpd restart
Stopping httpd:              [  OK  ]
Starting httpd:              [  OK  ]
[root@ser ~]# vim /etc/httpd/conf/httpd.conf 
ServerAdmin 
root@yjw.com
ServerName  mail.yjw.com:80 
AddHandler cgi-script .cgi .pl
七、登陆openwebmail.
在IE 中输入  mail.yjw.com/cgi-bin/openwebmail/openwebmail.pl,  这个地址是不是很长，那么我们来点短点的
在  httpd的 配置文件中添加 下面 内容：
ScriptAlias  /mail    /var/www/cgi-bin/openwebmail/openwebmail.pl
这样在IE 中直接输入
mail.yjw.com/mail
八、安装反垃圾邮件软件，MailScanner
到MailScanner .org 上下载MailScanner-4.75.11-1.rpm.tar.gz 
[root@ser ~]#  tar zxvf  MailScanner-4.75.11-1.rpm.tar.gz
[root@ser ~]#  cd  MailScanner-4.75.11
[root@ser MailScanner-4.75.11-1]# ./install.sh    # 安装
安装 spamassassin
先检查您的系统内是否已经安装SpamAssassin软件包。在文本终端中输入：
[root@ser ~]#          rpm -qa | grep spamassassin
spamassassin-3.1.9-1.el5
下载Mail-SpamAssassin-3.2.5.tar.gz
[root@ser ~]#tar  -zxvf Mail-SpamAssassin-3.2.5.tar.gz
[root@ser ~]# cd Mail-SpamAssassin-3.2.5
[root@ser ~]# perl Makefile.PL
[root@ser ~]# make 
[root@ser ~]#  make install
打开/etc/MailScanner/目录中的MailScanner.conf文件，主要说明修改的关键部分：
%org-name%  = yjw.com
%org-long-name% = yjw
web-site% = mail.yjw.com
Run As User = postfix
Run As Group = postfix
Incoming Queue Dir = /var/spool/postfix/hold
Outgoing Queue Dir = /var/spool/postfix/incoming
MTA = postfix
Incoming Work Group = postfix
Quarantine User = postfix  
Quarantine Group = postfix
Always Include SpamAssassin Report = yes
SpamAssassin User State Dir = /var/spool/MailScanner/spamassassin
SpamAssassin Install Prefix = /usr/bin
Log Speed = yes
Log Spam = yes
Log Silent Viruses = yes
Phishing Modify Subject = yes
更改incoming,quarantine 两个2个目录
[root@ser ~]# service spamassassin restart
[root@ser ~]# service spamassassin on
[root@ser ~]# service MailScanner  restart 
[root@ser ~]# service MailScanner  on
[root@ser ~]# chown -R postfix:postfix /var/spool/MailScanner/*
[root@ser ~]# cd /var/spool/MailScanner/
[root@ser MailScanner]# ll
drwxr-xr-x 4 postfix postfix 4096 Apr 30 16:56 incoming
drwxr-xr-x 3 postfix postfix 4096 Apr 29 19:10 quarantine
drwx------ 2 postfix postfix 4096 Apr 30 15:58 spamassassin
在/etc/postfix/header_checks 中增加一句话：
[root@ser ~]# vi  /etc/postfix/header_checks 
/^Received:/    HOLD  
设置中文邮件过滤规则
[root@ser ~]# wget -N -P 
http://www.ccert.edn.cn/spam/sa/Chiese_rules.cf
  /usr/share/spamassassin
使用计划任务来更新规则
[root@ser ~]#  crontab  -e
0 0 1 * * wget - N  -P   /usr/share/spamassassin 
http://www.ccert.edu.cn/spam/sa/Chiness_rules.cf
;  /etc/init.d/spamassassin restart
九、登陆openwebmail, 测试 收信，发信是否正常
[root@ser ~]# useradd  tom
[root@ser ~]# passwd  tom 
tom
tom
[root@ser ~]# useradd yjw
[root@ser ~]# passwd  yjw