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1.    Install Service poppassd
wget http://rpm.razorsedge.org/centos-5/RE/razorsedge-release-4-1.el5.re.noarch.rpm
rpm –Uvh  razorsedge-release-4-1.el5.re.noarch.rpm
yum install poppassd

Konfigurasi poppassd
vi  /etc/pam.d/poppassd

Ganti isi file poppassd dengan text sebagai berikut
auth      required    pam_unix.so
account   required    pam_unix.so
password  sufficient  pam_unix.so md5 shadow

Menjalankan service poppassd saat server restart atau boot
    
    chkconfig poppassd on
    service xinetd restart

Note :
poppassd dijalankan melalui service xinetd.
2.    Install Change Password dan Compatibility Plugin
Download plugin change password di
http://www.linuxmail.info/files/change_passwd-4.2f.tar.gz
dan Compatibility plugin di
http://www.squirrelmail.org/plugin_download.php?id=152&rev=1342

extract plugin-plugin tersebut di /usr/share/squirrelmail/plugins

Selanjutnya install plugin tersebut di squirrelmail dengan cara menjalankan file /usr/share/squirrelmail/config/conf.pl

Patch compatibility plugin dengan cara sebagai berikut
cd /usr/share/squirrelmail/plugins/compatibility/
patch -p0 < patches/compatibility_patch-1.4.8.diff


Mengaktifkan config di plugin change password
mv /usr/share/squirrelmail/plugins/change_passwd/config.php.sample  /usr/share/squirrelmail/plugins/change_passwd/config.php