ok I will tell you how to configure squirrelmail ...,
Squirrelmail is very easy to configure.......
for that u have to install its rpm..., its buildin in Linux CD's
& also u have to install imap package...... so first install imap rpm & after that
go to
#/etc/xinetd.d/imap
change disable=yes to disable=no
atart the service by:
#service xinetd restart
After that go to your web browser i.e open Mozilla
then type url as
127.0.0.1/webmail
or
localhost.localdomain/webmail
or
domainname/webmail
{
where domainname is your Domain......}
but before using above options , ensure that ur named ,httpd,sendmail must be restarted}
To configure Qmail go to this link
http://www.qmailrocks.org
Enjoy
Gaurav