There is also a web-based e-mail client that reads the Maildir directly (without having to install an IMAP or POP server), and that is sqwebmail: http://www.inter7.com/sqwebmail.html
sorry ,i have a problem after compiling sqwebmail when i launched my cgi webmail in my apache directory i get
The webmail system is temporarily unavailable. An error occured in function %s: %s</p></body></html>
CGI environment exceeds allowed maximum size.
This question would be better asked on the sqwebmail mailing list. Instructions to subscribe to that list are on the sqwebmail page (http://www.inter7.com/sqwebmail.html).
I have never installed sqwebmail, so I have no idea what is going on with that.