I have installed postfix and courier IMAP on my ubuntu server.
I assume its working fine as I can send and retrieve mails from the local host.I was wondering how can i do the same from my client PCs on the local intranet....which client do u suggest I install & configure?i wish to configure the clients in such a way to use the postfix on my server to send mails & retrieve mail from the IMAP server.

Secondly,how do i configure a webmail for the same?i installed squirrelmail,configured it for apapche and pointed to /localhost/squirrelmail...it takes me to the login page,but i dont know which username & password i should be using on this screen...plz help me out with this
Thanks in advance