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Postfix Admin

Postfix Admin is a web based interface used to manage mailboxes, virtual domains and aliases.

18 Alternatives To Postfix Admin

Kolab Community

Kolab Groupware is a secure, scalable, reliable, flexible, full-featured collaboration suite.

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.

Mailpile

Mailpile is a modern, fast web-mail client with user-friendly encryption and privacy features.

Microsoft Exchange Server

Microsoft Exchange Server is a messaging and collaborative software product developed by Microsoft.
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ProtonMail

Secure email with absolutely no compromises. Get your free encrypted email account today.

Zimbra Collaboration Suite

Zimbra Collaboration is an open, secure collaboration tool for email, calendaring, tasks and more.

mailcow dockerized

An open source mailserver suite.