Zimbra
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.
Zimbra Alternatives
The best Zimbra alternatives based on verified products, community votes, reviews and other factors.
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A fully fledged, free email server solution, an open source project (GPL v2).
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Web-based IMAP email client
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The #1 email warming service to improve your deliverability by generating realistic and meaningful engagement to your emails. Easy-to-use solution to help you land in the main inbox instead of the spam folder.
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An open source mailserver suite.
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Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
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Microsoft Exchange Server is a messaging and collaborative software product developed by Microsoft.
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Postfix is a mail transfer agent (MTA) that routes and delivers electronic mail.
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Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
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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.
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Google's encompassing suite of cloud-based business apps.
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Boost your productivity with reliable access anywhere with services like email, calendar, file sharing, meetings, instant messaging, and Office Online
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Mailbird is the best email client for Windows 7, 8 and 10
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Horde Groupware is a free, enterprise ready, browser based collaboration suite.
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hMailServer is a free e-mail server for Microsoft Windows.