Kopano 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.

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

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

Try for free freemium $9.0 / Monthly

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

Open Source

SOGo is groupware server with a focus on scalability and open standards.

Open Source

Google's encompassing suite of cloud-based business apps.

An open source mailserver suite.

Open Source

Open-Xchange Server 6 is the most advanced Linux based Groupware solution f.

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

Web-based IMAP email client

Open Source

On-premises, enterprise collaboration solution for documents, emails, calendars and more.

Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!

Boost your productivity with reliable access anywhere with services like email, calendar, file sharing, meetings, instant messaging, and Office Online

hMailServer is a free e-mail server for Microsoft Windows.