Best e-mail (web-based) script?

[Mysteriouskk]

Which is the best that is free

[Salam]

What do you exactly need ?
A script to make your site an email server or to send email using sendmail ?

[biggulp]

http://www.squirrelmail.org/
http://neomail.sourceforge.net/
http://www.horde.org/

web based scripts for reading your mail