OX Open-Xchange Alternatives

Zimbra is trusted by over 500 million users to increase productivity with a complete set of collaboration tools while maintaining total control over security and privacy.

Web-based IMAP email client

Warm up your cold email inbox, and never land in spam anymore!

Try for free freemium $9.0 / Monthly

An open source mailserver suite.

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.

Modoboa is a mail hosting and management platform including a modern and simplified Web User Interface.

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

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

Simple, easy and secure mail server with a convenient and simple interface.

Horde Groupware is a free, enterprise ready, browser based collaboration suite.

Mailu is a simple yet full-featured mail server as a set of Docker images.

Self hosted modern mail server

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

Sharing & communication software for business