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HEY - Email at its best, new from Basecamp.
mailcow - An open source mailserver suite.
Horde - Horde Groupware is a free, enterprise ready, browser based collaboration suite.
Modoboa - Modoboa is a mail hosting and management platform including a modern and simplified Web User Interface.
InstAddr - Disposable email address application.
Mail-in-a-box - Mail-in-a-Box provides webmail and an IMAP/SMTP server for use with mobile devices and desktop mail software and also includes contacts and calendar synchronization.