MailPlus license for 5 additional email accounts. Expansion package for five more email accounts, with no expiration date. Algorithm for fast full-text search. Intuitive web client and mobile apps for Android and iOS. Supports high-availability architecture for maximum service availability. Use Synology MailPlus for a secure, reliable, and private email server. By default, 5 free accounts are installed on a Synology NAS supported by MailPlus. With this Synology MailPlus license, you can increase the number of usable email accounts to a total of 10 accounts. Email aliases do not count as accounts, so no additional licenses are required for them. MailPlus can be used in your web browser and on mobile devices via the email app on Android and iOS devices. With tagging, filtering, and full-text search, you can easily organize your emails. MailPlus supports high-availability clusters. With its data mirroring mechanisms, Synology High Availability ensures that every bit of data is securely stored on a different physical unit. This process occurs in real-time, so in the event of hardware failures, all data remains intact and is quickly available again. When you log into your Synology account on your Synology NAS, you can add or manage the license keys in the MailPlus Server package license. A license key can only be applied to one Synology product supported by MailPlus at a time.