QmailClient is a free Android application developed by QNAP. It allows users to manage their email accounts on their QNAP NAS using their mobile devices. The app requires Android 5.0 or above and a QNAP NAS running firmware versionor above to function properly.

With QmailClient, users can browse their email accounts on the NAS anytime, anywhere. The app supports attaching photos from mobile devices when composing emails and allows users to download attachments to their mobile devices for offline reading. It also offers easy management of emails, including reading, replying, forwarding, moving, flagging, marking, or deleting mails on the NAS, all via their mobile devices. No computer is required for this.

Moreover, the app caches users' mail from the NAS to their mobile devices for offline reading. Overall, QmailClient is a useful app for those who want to manage their email accounts efficiently and effectively on their QNAP NAS using their mobile devices.