Courier Mail Server Configuration

I present this for my junior who wants learn about Debian mail server configuration for National Exam Practice. Enjoy and have a success :D

uninstall exim4-base >> apt-get remove exim4-base
install postfix, courier-imap, php5-imap, courier-pop >> apt-get install postfix courier-imap php5-imap courier-pop
web dir = No
mail name = domain.sch.id
maildir = No
Internet Site = OK
configure postfix at main.cf file >> nano /etc/postfix/main.cf
mydestination = domain.sch.id
mynetworks = 127.0.0.0/8 192.168.1.2/32
inet_interface = all
home_mailbox = Maildir/
install squirrel mail >> apt-get install squirrelmail
configure squirrel mail >> squirrelmail-configure
enter configuration then press D set predefined setting ..
choose option Courier Imap Server courier
Press S for save
Press Q for Quit editor
make squirrelmail VirtualHost >> nano /etc/apache2/apache2.conf
#include the virtual host configurations :
include /etc/apache2/sites-enabled/
add Include /etc/squirrelmail/apache.conf
restart apache >> /etc/init.d/apache2 restart
make Maildir >> cd /etc/skel/ then maildirmake Maildir
make user at /home >> adduser one
nano /etc/squirrelmail/apache.conf
#users will prefer a simple URL like http://webmail.example.com
VirtualHost
DocumentRoot /usr/share/squirrelmail
ServerName mail.domain.sch.id
VirtualHost
restart apache and postfix