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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.

NeutronMail

Self-hosted server for the ProtonMail client.
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ProtonMail

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

Roundcube

Web-based IMAP email client

Vesta Control Panel

– What I love about Vesta is that it’s fast and easy to use
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Virtualmin

It includes numerous features not in the GPL version (like script installers, resellers, HTML editor, an improved UI, mobile access, spam and virus filtering).
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Webmin

Webmin, Usermin, Virtualmin, Cloudmin, Linux, System Administration

Zimbra Collaboration Suite

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

Zoho is an all-in-one online office suite.

django-cyradm

django-cyradm is a web interface to manage postfix controlling accounts, aliases and virtual…

iRedMail

A fully fledged, free email server solution, an open source project (GPL v2).

mailcow dockerized

An open source mailserver suite.