The Synology MailPlus suite provides advanced and secure mail service with high usability. This suite consists of two packages: MailPlus Server and MailPlus. MailPlus Server is an administration console that offers diverse settings, while MailPlus is an email platform for client users.

This administrator's guide will guide you through the MailPlus Server setup and give detailed configuration instructions including DNS settings, mail service migration, and other security adjustments. The following key features are also contained in this guide to help you achieve the best practices: MailPlus high-availability for stable and continuous mail service, the mail queue for deferred message management, and the monitoring console displaying an overview of the MailPlus health status.