Phi-mail

[Gurvinder]

Phimail is a web based email system, using which you can provide email service to your visitors easily and cheap.
It requires only a shared webhosting with PHP and MySQL

Run on a shared webhosting server. PHP/MySQL are required on the server with a catchall email account
The mails are stotred in the MySQL database.
Unlimited users. The users are maintained in the database so there is no limit on the number of users until there is enough space.
Free setup and installation
Setup filters to move the mail to junk folder
Setup footers which will be added to each outgoing mail.
Setup maximum mailbox size.
Can create new skins and change the skin any time.
User can set up rules for mail organization in folders
Send mails in text or html format
For html mails wysiwyg editor