1.先下载安装软件包并搭建好 LNMP 环境（略）

2.编译安装postfix-2.9.3。
2.1创建postfix用户和组，且指定GID最好为大于1000的数值。
# groupadd -g 2525 postfix
# useradd -g postfix -u 2525 -s /sbin/nologin -M postfix
# groupadd -g 2526 postdrop
# useradd -g postdrop -u 2526 -s /sbin/nologin -M postdrop
2.2 编译安装postfix

# tar xf postfix-2.11.0.tar.gz
# cd postfix-2.11.0
更新makefile文件，添加mysql、sasl认证支持：
# make makefiles ‘CCARGS=-DHAS_MYSQL -I/usr/local/webserver/mysql/include -DUSE_SASL_AUTH -DUSE_CYRUS_SASL -I/usr/include/sasl -DUSE_TLS ‘ ‘AUXLIBS=-L/usr/local/webserver/mysql/lib -lmysqlclient -lz -lm -L/usr/lib/sasl2 -lsasl2 -lssl -lcrypto’
备注：-DUSE_SASL_AUTH表示启用SASL认证
# make && make install
Install 的时候路径可以全部默认，也可以自己更改
生成二进制文件，提高服务器性能（重要）
# newaliases
添加启动脚本：
vim /etc/rc.d/init.d/postfix

#!/bin/bash
#
# postfix Postfix Mail Transfer Agent
#
# chkconfig: 2345 80 30
# description: Postfix is a Mail Transport Agent, which is the program \
# that moves mail from one machine to another.
# processname: master
# pidfile: /var/spool/postfix/pid/master.pid
# config: /etc/postfix/main.cf
# config: /etc/postfix/master.cf

# Source function library.
. /etc/rc.d/init.d/functions

# Source networking configuration.
. /etc/sysconfig/network

# Check that networking is up.
[ $NETWORKING = “no” ] && exit 3

[ -x /usr/sbin/postfix ] || exit 4
[ -d /etc/postfix ] || exit 5
[ -d /var/spool/postfix ] || exit 6

RETVAL=0
prog=”postfix”

start() {
# Start daemons.
echo -n $”Starting postfix: ”
/usr/bin/newaliases >/dev/null 2>&1
/usr/sbin/postfix start 2>/dev/null 1>&2 && success || failure $”$prog start”
RETVAL=$?
[ $RETVAL -eq 0 ] && touch /var/lock/subsys/postfix
echo
return $RETVAL
}

stop() {
# Stop daemons.
echo -n $”Shutting down postfix: ”
/usr/sbin/postfix stop 2>/dev/null 1>&2 && success || failure $”$prog stop”
RETVAL=$?
[ $RETVAL -eq 0 ] && rm -f /var/lock/subsys/postfix
echo
return $RETVAL
}

reload() {
echo -n $”Reloading postfix: ”
/usr/sbin/postfix reload 2>/dev/null 1>&2 && success || failure $”$prog reload”
RETVAL=$?
echo
return $RETVAL
}

abort() {
/usr/sbin/postfix abort 2>/dev/null 1>&2 && success || failure $”$prog abort”
return $?
}

flush() {
/usr/sbin/postfix flush 2>/dev/null 1>&2 && success || failure $”$prog flush”
return $?
}

check() {
/usr/sbin/postfix check 2>/dev/null 1>&2 && success || failure $”$prog check”
return $?
}

restart() {
stop
start
}

# See how we were called.
case “$1″ in
start)
start
;;
stop)
stop
;;
restart)
stop
start
;;
reload)
reload
;;
abort)
abort
;;
flush)
flush
;;
check)
check
;;
status)
status master
;;
condrestart)
[ -f /var/lock/subsys/postfix ] && restart || :
;;
*)
echo $”Usage: $0 {start|stop|restart|reload|abort|flush|check|status|condrestart}”
exit 1
esac

exit $?

# chmod +x /etc/rc.d/init.d/postfix
# chkconfig –add postfix
# chkconfig postfix on
# service postfix start
Starting postfix: [ OK ]

检查服务是否开始监听端口
# sudo netstat -tupln
看到25端口开始监听并且程序名称为 master 则为成功

postfix文件配置规则:
1、在postfix的配置文件中，参数行和注释行是不能处在同一行中的；
2、任何一个参数的值都不需要加引号，否则，引号将会被当作参数值的一部分来使用；
3、每修改参数及其值后执行 postfix reload 即可令其生效；但若修改了inet_interfaces，则需重新启动postfix；
4、如果一个参数的值有多个，可以将它们放在不同的行中，只需要在其后的每行前多置一个空格即可, postfix会把第一个字符为空格或tab的文本行视为上一行的延续.

# vim /etc/postfix/main.cf #增加如下内容
broken_sasl_auth_clients = yes
smtpd_recipient_restrictions=permit_mynetworks,permit_sasl_authenticated,reject_invalid_hostname,reject_non_fqdn_hostname,reject_unknown_sender_domain,reject_non_fqdn_sender,reject_non_fqdn_recipient,reject_unknown_recipient_domain,reject_unauth_pipelining,reject_unauth_destination
smtpd_sasl_auth_enable = yes
smtpd_sasl_local_domain = $myhostname
smtpd_sasl_security_options = noanonymous
smtpdsmtpdsmtpd_sasl_application_name = smtpd
smtpd_banner = Welcome to our $myhostname
ESMTP,Warning: Version not Available!

# vim /usr/lib/sasl2/smtpd.conf #添加下边两行
pwcheck_method: saslauthd
mech_list: PLAIN LOGIN

Dovecot 编译参数
CPPFLAGS=-I/usr/local/webserver/mysql/include LDFLAGS=-L/usr/local/webserver/mysql/lib ./configure –with-mysql –with-sql –with-ssl=openssl –with-pam –sysconfdir=/etc/