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

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

The Mercury Mail Transport System is a mail server that sends and receives messages on behalf of a...

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

Axigen is an integrated email, calendaring & collaboration platform, built on a Linux mail server technology.

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

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

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

Microsoft Office is an office suite of desktop applications, servers, and services for the Microsoft Windows and OS X operating systems.

Xeams is a secure and powerful mail server for that includes a powerful spam filtering engine that...

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

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