sys4 specifies and builds turn-key mail systems for high performance. From SMTP boundary filters to mail servers to outbound clusters optimized for deliverability.

The core team for messaging solutions includes Ralf Hildebrandt and Patrick Ben Koetter, authors of "The Book of Postfix: State-Of-The-Art Message-Transport", a global bestseller and the leading reference publication in its field. Remote support including diagnostics and solution development is their daily business.

Dovecot Solutions Oy, Finland, are main technology partners. sys4 is able to implement the industry benchmark open source POP/IMAP server "Dovecot" in extremely challenging environments. Migration from legacy systems to service-based state-of-the-art email platforms is a particular strength of sys4. The practical experience gained is fed back into Dovecot's development pipeline.

The open source project automx is a typical example for sys4's approach to designing email systems with superior efficiency, security and usability. With automx, creating and managing email accounts becomes a breeze.