iredmail装好后还需要添加一些常用的插件
roundcube的插件下载地址：
http://trac.roundcube.net/wiki/Plugin_Repository
安装iredmail时自带的5.3 roundcube已经安装了二十多款插件，在plugins 文件加可以看到
drwxr-xr-x 27 root root 4096 2011-08-03 14:35 ./
drwxr-xr-x 11 root root 4096 2011-07-29 10:15 ../
drwxr-xr-x 2 root root 4096 2011-07-25 16:59 additional_message_headers/
drwxr-xr-x 4 root root 4096 2011-07-25 16:59 archive/
drwxr-xr-x 2 root root 4096 2011-07-25 16:59 autologon/
drwxr-xr-x 4 501 staff 4096 2011-08-03 14:01 compose_addressbook/
-rw-r--r-- 1 root root 30698 2011-05-30 04:17 compose_addressbook-4.2.tgz
drwxr-xr-x 2 root root 4096 2011-07-25 16:59 database_attachments/
drwxr-xr-x 3 root root 4096 2011-07-25 16:59 debug_logger/
drwxr-xr-x 2 root root 4096 2011-07-25 16:59 emoticons/
drwxr-xr-x 2 root root 4096 2011-07-25 16:59 example_addressbook/
drwxr-xr-x 2 root root 4096 2011-07-25 16:59 filesystem_attachments/
drwxr-xr-x 3 root root 4096 2011-08-03 14:29 globaladdressbook/
drwxr-xr-x 5 root root 4096 2011-07-25 16:59 help/
drwxr-xr-x 2 root root 4096 2011-07-25 16:59 http_authentication/
drwxr-xr-x 4 501 staff 4096 2011-05-30 04:30 jqueryui/
-rw-r--r-- 1 root root 117151 2011-05-30 04:30 jqueryui-1.8.6.1.tgz
drwxr-xr-x 6 root root 4096 2011-07-25 16:59 managesieve/
drwxr-xr-x 4 root root 4096 2011-07-25 16:59 markasjunk/
drwxr-xr-x 3 root root 4096 2011-07-25 16:59 new_user_dialog/
drwxr-xr-x 2 root root 4096 2011-07-25 16:59 new_user_identity/
drwxr-xr-x 4 root root 4096 2011-07-25 16:59 password/
drwxr-xr-x 2 root root 4096 2011-07-25 16:59 show_additional_headers/
drwxr-xr-x 2 root root 4096 2011-07-25 16:59 squirrelmail_usercopy/
drwxr-xr-x 3 root root 4096 2011-07-25 16:59 subscriptions_option/
drwxr-xr-x 3 root root 4096 2011-07-25 16:59 userinfo/
-rw-r--r-- 1 root root 8340 2011-08-03 12:46 v0.5-stable
drwxr-xr-x 4 root root 4096 2011-07-25 16:59 vcard_attachments/
drwxr-xr-x 2 root root 4096 2011-07-25 16:59 virtuser_file/
drwxr-xr-x 2 root root 4096 2011-06-02 21:37 virtuser_query/
对应的配置文件修改：main.ini.php
// List of active plugins (in plugins/ directory)
$rcmail_config['plugins'] = array("password","managesieve","globaladdressbook","emoticons","userinfo","jqueryui","compose_addressbook",);
按照格式添加相应的插件，相关文档可以到插件主页查看。
除了默认的插件外，我还下载添加了
compose_addressbook //写邮件时选择收件人
下载地址：
http://roundcube-plugins.googlecode.com/files/compose_addressbook-4.2.tgz
globaladdressbook（需jqueryui支持） //全局地址薄
下载 globaladdressbook
https://nodeload.github.com/JohnDoh/Roundcube-Plugin-Global-Address-Book/zipball/v0.5-stable
下载 jqueryui
http://roundcube-plugins.googlecode.com/files/jqueryui-1.8.6.1.tgz
两个插件
步骤：
放置于plugins文件夹下面，修改插件配置文件，修改main.ini.php配置文件