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AtMail Open

AtMail is an open source webmail client written in PHP. We aim to provide a elegant Ajax webmail client for existing IMAP mailservers, with less bloat and a focus on an intuitive, simple user interface. The open source version of AtMail provides users with a lightweight, yet powerful webmail client. The software can be installed on a variety of platforms with ease and without the hassles that most webmail platforms impart.

NaSMail

NaSMail

NaSMail is a standards-based webmail package written in PHP. It includes built-in pure PHP support for the IMAP and SMTP proto ...

Sendmail

Sendmail

Sendmail is a general purpose internetwork email routing facility that supports many kinds of transfer and delivery methods, i ...