hMailServer is a free, open source, e-mail server for Microsoft Windows. It's used by Internet service providers, companies, governments, schools and enthusiasts in all parts of the world.

It supports the common e-mail protocols (IMAP, SMTP and POP3) and can easily be integrated with many existing web mail systems. It has flexible score-based spam protection and can attach to your virus scanner to scan all incoming and outgoing email.


PayPal Logo Want to contribute to the hMailServer project? Help out with the translations, help people in the end-user forum or donate money. The latest donations comes from KR inn, MyRoundcube Dev Team - MyRoundcube Plugins and VDL-Fittings (Van de Lande BV.).

Quick Download

hMailServer 5.4.2, build 1964 is the latest hMailServer production version. After download, you might want to read the installation quick-guide to get a jumpstart.
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hMailServer newsletters

There are three hMailServer news letters you can susbscribe to: The release news letter, the build news letter and the security news letter.

Data store

MySQL DevConnect For optimal performance, hMailServer uses a database server for data storage - MySQL, Microsoft SQL Server or PostgreSQL, depending on your choice. A minimal edition of Microsoft SQL Server is embedded within hMailServer, so if you don't already have a database server in your network, this is automatically taken care of for you.

Integrating hMailServer

hMailServer comes with an easy-to-use and broad API which can be used for integration with other software in your environment. As an example, many Internet service providers connect hMailServer to their existing administration system to reduce manual work involved with managing user accounts. hMailServer also has a built-in Active Directory integration.