From LQWiki

webmail is a facility to read/write email using a web-browser interface.

Products

• SquirrelMail features easy installation.
• Horde
• RoundCube is an upcoming web mail option. Featuring Ajax' advanced usability.
• BlueMamba
• IlohaMail
• UebiMiau

Security

Only allow trusted users and force https: Securing Apache

See also

• Security
• Web server
• Email server
• Email Client