5.安装postfix 2.2.3
如果你的系统上原来有sendmail，先将其停止并将其文件改名：
# /etc/init.d/sendmail stop
# chkconfig --level 0123456 sendmail off
# mv /usr/bin/newaliases /usr/bin/newaliases.orig
# mv /usr/bin/mailq /usr/bin/mailq.orig
# mv /usr/sbin/sendmail /usr/sbin/sendmail.orig
开始安装
# groupadd -g 12345 postfix
# useradd -u 12345 -g 12345 -c postfix -d/dev/null -s/bin/false postfix
# groupadd -g 54321 postdrop
# wget ftp://postfix.cn99.com/postfix/official/postfix-2.2.3.tar.gz
# tar -zxvf postfix-2.2.3.tar.gz
# cd postfix-2.2.3
(Building Postfix with SASL authentication and mysql support)
# make -f Makefile.init makefiles \
'CCARGS=-DHAS_MYSQL -I/usr/local/mysql/include/mysql -DUSE_SASL_AUTH -I/usr/local/include/sasl' \
'AUXLIBS=-L/usr/local/mysql/lib/mysql -lmysqlclient -lz -lm -L/usr/local/lib -lsasl2'
# make install
如果/etc/aliases文件不存在，请用如下命令创建：
# echo postfix: root >> /etc/aliases
# /usr/bin/newaliases
注意：
本例中Mysql安装在/usr/lcoal/mysql，sasl2安装在/usr/lib/sasl2。如果安装路径不同，请自行修改编译时CCARGS和AUXLIBS选项。
在执行make install的时候可能会得到如下的提示(如果没有就不用管了)：
/usr/libexec/ld-elf.so.1: Shared object "libmysqlclient.so.12" not found
这是因为mysql不是安装在默认目录中的，所以需要告诉postfix应该到哪里去找libmysqlclient.so.12，使用ldconfig就可以达到这个目的：
# echo /usr/local/mysql/lib/mysql >> /etc/ld.so.conf
# ldconfig
6.安装postfixadmin 2.1.0
建立apache和maildrop的用户和组
# groupadd vmail -g 1001
# useradd vmail -u 1001 -g 1001 -s/bin/false -d/dev/null
# vi /usr/local/apache/conf/httpd.conf
把
User nobody
Group #-1
改为
User vmail
Group vmail
# wget http://high5.net/postfixadmin/download.php?file=postfixadmin-2.1.0.tgz
# tar -zxvf postfixadmin-2.1.0.tgz
# mv postfixadmin-2.1.0 /var/www/postfixadmin
更改权限，假定运行apache的用户和组为vmail
# chown -R vmail:vmail /var/www/postfixadmin
# cd /var/www/postfixadmin
# chmod 640 *.php *.css
# cd /var/www/postfixadmin/admin/
# chmod 640 *.php .ht*
# cd /var/www/postfixadmin/images/
# chmod 640 *.gif *.png
# cd /var/www/postfixadmin/languages/
# chmod 640 *.lang
# cd /var/www/postfixadmin/templates/
# chmod 640 *.tpl
# cd /var/www/postfixadmin/users/
# chmod 640 *.php
建立mysql表
# cd /var/www/postfixadmin
# mysql -u root [-p] < DATABASE_MYSQL.TXT
# cp config.inc.php.sample config.inc.php
# vi config.inc.php
本例中的配置如下：
// Language config
// Language files are located in './languages'.
$CONF['default_language'] = 'cn';
// Database Config
// 'database_type' is for future reference.
$CONF['database_type'] = 'mysql';
$CONF['database_host'] = 'localhost';
$CONF['database_user'] = 'postfixadmin';
$CONF['database_password'] = 'postfixadmin';
$CONF['database_name'] = 'postfix';
//$CONF['encrypt'] = 'md5crypt';
$CONF['encrypt'] = 'cleartext';
// Mailboxes
// If you want to store the mailboxes per domain set this to 'YES'.
// Example: /usr/local/virtual/domain.tld/username@domain.tld
$CONF['domain_path'] = 'YES';
// If you don't want to have the domain in your mailbox set this to 'NO'.
// Example: /usr/local/virtual/domain.tld/username
$CONF['domain_in_mailbox'] = 'NO';
// Quota
// When you want to enforce quota for your mailbox users set this to 'YES'.
$CONF['quota'] = 'YES';
// You can either use '1024000' or '1048576'
$CONF['quota_multiplier'] = '1024000';
我们在这里使用明文口令方式，如果想使用密文，请把$CONF['encrypt']='cleartext';改成$CONF['encrypt']='md5crypt';
邮箱的存储格式使用domain.ltd/username的形式，所以设置：
$CONF['domain_path'] = 'YES';
$CONF['domain_in_mailbox'] = 'NO';
然后打开浏览器，进入postfixadmin的欢迎界面，点击网页上的setup，看看检查是否通过，记得要删除setup.php文件。然后进入http://www.yourdomain.com/postfixadmin/admin/index.php，就可以新建域名、管理员以及邮箱了。
# vi /etc/postfix/main.cf
#=====================BASE=========================
#主机名称(用 FQDN 的方式来写)
myhostname = www.test.com
#domain 名称
mydomain = test.com
#邮件标头上面的 mail from 的那个地址
myorigin = $mydomain
#可用来收件的主机名称（这里没有使用$mydomain是因为我们将使用virtualhost）
mydestination = $myhostname localhost localhost.$mydomain
#允许不使用smtp发信认证的网段
mynetworks = 127.0.0.0/8
inet_interfaces = all
#使用的邮箱格式
#home_mailbox = Maildir/
#mailbox_transport = maildrop
#=====================Vritual Mailbox settings=========================
# 指定用户邮箱所在的根目录
virtual_mailbox_base = /var/mailbox/
#指定postfix如何去检索邮件用户,这里是采用mysql (用户邮箱的目录)
virtual_mailbox_maps = mysql:/etc/postfix/mysql/mysql_virtual_mailbox_maps.cf
virtual_mailbox_domains = mysql:/etc/postfix/mysql/mysql_virtual_domains_maps.cf
virtual_alias_domains =
virtual_alias_maps = mysql:/etc/postfix/mysql/mysql_virtual_alias_maps.cf
#邮件账号的uid, 使用apache的运行用户
virtual_uid_maps = static:1001
virtual_gid_maps = static:1001
#virtual_uid_maps = mysql:/etc/postfix/mysql/mysql-virtual_uid_maps.cf
#virtual_gid_maps = mysql:/etc/postfix/mysql/mysql-virtual_gid_maps.cf
# use this for virtual delivery（如果没有安装maildrop，则此处为virtual）
#virtual_transport = virtual
#use this for maildrop-delivery （如果有maildrop，则此处为maildrop）
virtual_transport = maildrop
#Maildrop-Options for usage with maildrop
maildrop_destination_recipient_limit = 1
maildrop_destination_concurrency_limit = 1
#/var/mailbox/最后的"/"字符不能省略
#所有的MySQL查询配置文件统一存放在/etc/postfix/mysql中
#====================QUOTA========================
#每封信的最大大小(10M),postfix的默认值是10M, 但这指的是邮件正文和编码后附件的总和, 经过#base64编码,附件的大小会增加35%左右, 因此这里设定可接受邮件的大小为14M
message_size_limit = 14336000
#邮箱的默认大小(10M)
virtual_mailbox_limit = 20971520
virtual_create_maildirsize = yes
virtual_mailbox_extended = yes
#指定postfix如何获得用户的quota信息(每个用户的邮箱大小)
virtual_mailbox_limit_maps = mysql:/etc/postfix/mysql/mysql_virtual_mailbox_limit_maps.cf
# 是否允许覆盖默认邮箱的大小
virtual_mailbox_limit_override = yes
virtual_maildir_limit_message = Sorry, the user's maildir has overdrawn his diskspace quota, please try again later.
virtual_overquota_bounce = yes
#====================SASL========================
broken_sasl_auth_clients = yes
#In order to allow mail relaying by authenticated clients
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,
permit
smtpd_sasl_auth_enable = yes
smtpd_sasl_local_domain = $myhostname
smtpd_sasl_security_options = noanonymous
smtpd_sasl_application_name = smtpd
smtpd_banner=$myhostname ESMTP "Version not Available"
建立/var/mailbox并设置权限
# mkdir /var/mailbox
# chown -R vmail:vmail /var/mailbox
# chmod -R ug+rwx,o-rwx /var/mailbox
建立/etc/postfix/mysql文件夹和MySQL查询配置文件
# mkdir /etc/postfix/mysql
1、vi /etc/postfix/mysql/mysql_virtual_alias_maps.cf
user = postfix
password = postfix
hosts = localhost
dbname = postfix
table = alias
select_field = goto
where_field = address
2、vi /etc/postfix/mysql/mysql_virtual_domains_maps.cf
user = postfix
password = postfix
hosts = localhost
dbname = postfix
table = domain
select_field = description
where_field = domain
#additional_conditions = and backupmx = '0' and active = '1'
3、vi /etc/postfix/mysql/mysql_virtual_mailbox_maps.cf
user = postfix
password = postfix
hosts = localhost
dbname = postfix
table = mailbox
select_field = maildir
where_field = username
#additional_conditions = and active = '1'
4、vi /etc/postfix/mysql/mysql_virtual_mailbox_limit_maps.cf
user = postfix
password = postfix
hosts = localhost
dbname = postfix
table = mailbox
select_field = quota
where_field = username
#additional_conditions = and active = '1'
配置 /usr/local/lib/sasl2/smtpd.conf
# vi /usr/local/lib/sasl2/smtpd.conf
pwcheck_method: auxprop
auxprop_plugin: sql
mech_list: plain login
sql_engine: mysql
sql_hostnames: localhost
sql_user: postfix
sql_passwd: postfix
sql_database: postfix
sql_select: SELECT password FROM mailbox WHERE username='%u@%r' and domain='%r' and active='1'
启动postfix
# postfix start
测试smtp
# telnet localhost 25
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
220 www.test.com ESMTP "Version not Available"
ehlo www.test.com
250-www.test.com
250-PIPELINING
250-SIZE 10240000
250-VRFY
250-ETRN
250-AUTH LOGIN PLAIN
250-AUTH=LOGIN PLAIN
250 8BITMIME
7.安装Courier-authlib 0.55
新版本的imap不再包含authentication library，必须先安装 Courier authentication library
# wget http://www.courier-mta.org/beta/courier-authlib/courier-authlib-0.55.20050407.tar.bz2
# tar -jxvf courier-authlib-0.55.20050407.tar.bz2
# cd courier-authlib-0.55.20050407
# ./configure \
--with-redhat \
--with-authmysql=yes \
--with-mailuser=vmail --with-mailgroup=vmail \
--with-mysql-libs=/usr/local/mysql/lib/mysql --with-mysql-includes=/usr/local/mysql/include/mysql/
# make
# make install
# make install-configure
# vi /usr/local/etc/authlib/authdaemonrc （确保只使用mysql认证模块）
authmodulelist="authmysql"
authmodulelistorig="authmysql"
# vi /usr/local/etc/authlib/authmysqlrc
MYSQL_SERVER localhost
MYSQL_SOCKET /tmp/mysql.sock
MYSQL_DATABASE postfix
MYSQL_USERNAME postfix
MYSQL_PASSWORD postfix
MYSQL_USER_TABLE mailbox
MYSQL_LOGIN_FIELD username
#MYSQL_CRYPT_PWFIELD password
MYSQL_CLEAR_PWFIELD password
MYSQL_UID_FIELD '1001'
MYSQL_GID_FIELD '1001'
MYSQL_HOME_FIELD '/var/mailbox/'
MYSQL_MAILDIR_FIELD maildir
MYSQL_NAME_FIELD name
MYSQL_QUOTA_FIELD quota
MYSQL_WHERE_CLAUSE active='1'
DEFAULT_DOMAIN test.com
注意：确认在这个文件中不能用空格键，只能用tab键。
确认只使用单引号，比如：'/var/mailbox/','UID','GID'（本文为'1001'）
localhost不能用单引号
确认你的/etc/hosts文件中有localhost
编译时如果支持Ipv6可能导致错误
MYSQL_GID_FIELD 和MYSQL_UID_FIELD是maildrop的UID和GID，而不是MySQL的。
如果想使用md5密码，把MYSQL_CLEAR_PWFIELD password改成MYSQL_CRYPT_PWFIELD password
启动服务
要是想让imap开机就启动服务：
# cp courier-authlib.sysvinit /etc/rc.d/init.d/courier-authlib
# chmod 755 /etc/rc.d/init.d/courier-authlib
# chkconfig --level 0123456 courier-authlib on
手动启动服务：
# authdaemond start
测试courier-authlib
检查进程：
# pstree |grep authdaemond
|-authdaemond.mys---5*[authdaemond.mys]
8.安装Courier-imap 4.0.2
# wget http://www.courier-mta.org/beta/imap/courier-imap-4.0.2.20050403.tar.bz2
# tar -jxvf courier-imap-4.0.2.20050403.tar.bz2
# cd courier-imap-4.0.2.20050403
# ./configure \
--prefix=/usr/local/imap \
--with-redhat \
--disable-root-check \
--enable-unicode=utf-8,iso-8859-1,gb2312,gbk,gb18030 \
--with-trashquota \
--with-dirsync
# make
# make install-strip （先install-strip，如果失败，再make install）
# make install-configure
# vi /usr/local/imap/etc/pop3d
将POP3DSTART=NO改为POP3DSTART=YES
# vi /usr/local/imap/etc/imapd
将IMAPDSTART=NO改为IMAPDSTART=YES
让imap自启动：
# cp courier-imap.sysvinit /etc/rc.d/init.d/courier-imap
# chmod 755 /etc/rc.d/init.d/courier-imap
# chkconfig --level 0123456 courier-imap on
手动启动服务：
# /usr/local/imap/libexec/pop3d.rc start
# /usr/local/imap/libexec/imapd.rc start
测试courier-imap
检查进程：
# pstree |grep courier
|-2*[courierlogger]
|-2*[couriertcpd]
检查端口，应该有如下端口打开：
# netstat -an |grep LISTEN
tcp00 0.0.0.0:1100.0.0.0:*LISTEN
tcp00 0.0.0.0:1430.0.0.0:*LISTEN
检测POP3和IMAP服务：
# telnet localhost 110
+OK Hello there
USER test@test.com
+OK Password required.
PASS test
+OK Logged in.
QUIT
+OK bye-bye
9.安装Courier-maildrop 1.8.0
# groupadd vmail -g 1001
# useradd vmail -u 1001 -g 1001 -s/bin/false -d/dev/null
# wget http://jaist.dl.sourceforge.net/sourceforge/courier/maildrop-1.8.0.tar.bz2
# tar jxvf maildrop-1.8.0.tar.bz2
# cd maildrop-1.8.0
# ./configure \
--prefix=/usr/local/maildrop \
--enable-sendmail=/usr/sbin/sendmail \
--enable-trusted-users='root vmail' \
--enable-syslog=1 \
--enable-maildirquota \
--enable-maildrop-uid=1001 \
--enable-maildrop-gid=1001 \
--with-trashquota \
--with-dirsync
# make
# make install
# cp /usr/local/maildrop/bin/maildrop /usr/bin
# chmod a+rx /usr/bin/maildrop
运行maildrop -v应该有如下提示信息：
maildrop 1.8.0 Copyright 1998-2004 Double Precision, Inc.
GDBM extensions enabled.
Courier Authentication Library extension enabled.
Maildir quota extension enabled.
This program is distributed under the terms of the GNU General Public
License. See COPYING for additional information.
新建/etc/maildroprc文件
# vi /etc/maildroprc
logfile "/var/mailbox/maildrop.log"
to "$HOME$DEFAULT"
# chmod a+r /etc/maildroprc
配置Postfix
# vi /etc/postfix/main.cf
virtual_transport = maildrop
maildrop_destination_recipient_limit = 1
# vi /etc/postfix/master.cf
maildrop unix - n n - - pipe
flags=DRhu user=vmail:vmail argv=/usr/local/maildrop/bin/maildrop -w 90 -d $
由于maildrop没有建立及删除maildir的功能，因此由脚本实现（是否有什么安全隐患？）
# vi /etc/sudoers
vmail ALL = NOPASSWD: /usr/sbin/maildirmake.sh , /usr/sbin/maildirdel.sh
新建/usr/sbin/maildirmake.sh文件
# vi /usr/sbin/maildirmake.sh
#!/bin/bash
set -e
if [ ! -f /var/mailbox/ ]
then
mkdir /var/mailbox/
fi
chown -R vmail:vmail /var/mailbox/
cd "/var/mailbox/"
/usr/local/imap/bin/maildirmake
chown -R 1001:12345 /var/mailbox//
chmod -R g=s /var/mailbox//
新建/usr/sbin/maildirdel.sh文件
# vi /usr/sbin/maildirmake.sh
#!/bin/bash
rm -rf /var/mailbox//
# chmod 755 /usr/sbin/maildirmake.sh
# chmod 755 /usr/sbin/maildirdel.sh
更改postfixadmin目录及postfixadmin/admin目录下的create-mailbox.php文件
在这两个文件的$tQuota = $CONF['maxquota'];行后加一行：
# vi /var/www/postfixadmin/admin/create-mailbox.php (vi /var/www/postfixadmin/create-mailbox.php)
system("sudo /usr/sbin/maildirmake.sh $fDomain ".$_POST['fUsername']);
更改postfixadmin目录及postfixadmin/admin目录下的delete.php文件
在这两个文件的$result = db_query ("SELECT * FROM mailbox WHERE username='$fDelete' AND domain='$fDomain'");行后加几行：
# vi /var/www/postfixadmin/admin/delete.php (vi /var/www/postfixadmin/delete.php)
$userarray=explode("@",$fDelete);
$user=$userarray[0];
$domain=$userarray[1];
system("sudo /usr/sbin/maildirdel.sh $domain $user");
说明：
建立的邮箱格式：/var/vmail/domain.tld/username
uid 1001 是vmail的用户id，也是目录/var/vmail的owner
gid 12345 是postfix的组id
在postfixadmin中建立一测试帐户test@test.com
测试maildrop
# maildrop -V 9 -d test@test.com
maildrop: authlib: groupid=1001
maildrop: authlib: userid=1001
maildrop: authlib: logname=test@test.com, home=/var/mailbox/, mail=test.com/test/
maildrop: Changing to /var/mailbox/
ctrl+c退出
下一步，查看日志(/var/log/maillog)看看postfix是不是和maildrop一起工作：
# cat /var/log/maillog | grep maildrop -A 2
Feb 28 11:50:41 malochia postfix/qmgr[7345]: 2875B7823E62: from=<remote@user.nl>, size=3308, nrcpt=1 (queue active)
Feb 28 17:18:05 malochia postfix/pipe[11615]: 04DD57822697: to=<user@domain.tld>, relay=maildrop, delay=0, status=sent (domain.tld)
如果没有，看看是不是由于配置不正确，而使邮件在队列中
# Mailq
配置quotas
新建文件/usr/local/maildrop/etc/quotawarnmsg
# vi /usr/local/maildrop/etc/quotawarnmsg
From: 管理员 test.com <postmaster@test.com>
Reply-To: postmaster@test.com
To: Valued Customer:;
Subject: 警告！您的邮箱空间即将用完！
Mime-Version: 1.0
Content-Type: text/plain; charset=gb2312
Content-Transfer-Encoding: 8bit
亲爱的用户，您的邮箱空间已用了90％。如果还想继续收到邮件的话，请删除一些邮件。
设置quotas
Postfixadmin的数据库的maildrop表的quota字段是int类型的，在maildrop下不能工作，不过我们可以修改 /usr/local/etc/authlib/authmysqlrc文件，把其中的MYSQL_QUOTA_FIELD quota一行改为MYSQL_QUOTA_FIELD concat(quota,'S') ，如果你想限制邮件的数量，也可以改成MYSQL_QUOTA_FIELD concat(quota,'C')。
如果我们把一个用户的邮箱设为10M，我们可以把quota的值改为“10000000S”。也可以用“C”，“1000C”的意思是只能存放1000条邮件。
给test@test.com发一封信，但是不用包含附件。然后：
# cd /var/mailbox/test.com/test
# cat maildirsize
1000000S
1622 1
maildirsize这个文件存储了邮箱配额的信息，而且courier-imap也用这个文件。
举个例子说明一下该文件，我的一个maildirsize文件的内容如下：
# cat maildirsize
5000000S
42898 9
3403 1
1622 1
2371 1
说明这个邮箱的容量是5M（如果你把quota字段的值删除，maildrop会自动给它一个值，但是不要把它的值设置成null），现在邮箱里有四封信。
假设该用户用掉了5M中的3M，只剩2M了，如果来了一封大于2M的邮件，将会被退回，如果是1.7M的邮件，maildrop会收下该邮件，更新maildirsize文件，重新计算quota，得知该用户使用了90％（/etc/postfix/master.cf中的-w 90）以上的配额，maildrop会拷贝/usr/local/maildrop/etc/quotawarnmsg文件到该用户的邮箱中警告该用户。
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