FAQ

Is Nixt DNA Server free?

Yes, on your own servers or in your own cloud, for up to 25 mailboxes, one domain and one server, with every security feature. Past that, every mailbox is on a Business or Enterprise licence. See Licences.

What counts as a mailbox?

A person who signs in. Aliases, groups, rooms and shared mailboxes do not count. See What is counted.

What happens if my licence runs out?

Nothing at once. The server works in full for 10 days, then carries 500 messages a month. Mail past that is held, not refused and not lost, and it goes on by itself as soon as a valid licence is installed. See When a licence runs out.

Does the server need to reach you?

Not for its licence: it checks the licence offline, against a key built into it. See Licences.

What does it run on?

Linux, on x86-64 or ARM64: from a package, in a container, on Kubernetes, or from an offline bundle. See Ways to install and Requirements.

Which mail apps work with it?

Any app that speaks IMAP, POP3 or SMTP, such as Apple Mail, Outlook and Thunderbird; Nixt Mail, which also uses JMAP; and calendar and contacts apps over CalDAV and CardDAV. Most apps set themselves up from an email address. See Connecting mail apps.

Can I move mail from my current server?

Yes: from any server that offers IMAP, from Microsoft 365 and Google Workspace without anybody’s password, and from PST, MBOX and Maildir files. See Moving mail from another server.

My provider blocks port 25. Can I still use it?

Yes. Other servers still deliver to you on port 25, and you send through a relay. See Can this machine send mail directly?

How do I back it up?

The server can take a backup every day by itself. Keep the key file apart from the backups. See Backup and restore.

How do I upgrade?

nixt-server upgrade says what a release changes before it starts, and puts the old release back if the new one finds a problem. See Upgrades.

Is my mail encrypted on disk?

Yes. Message bodies are encrypted per organisation with AES-256-GCM, under a key protected by the server’s key-encryption key. See The key file.

Where do I get help?

See Support by plan. To report a security problem, see Reporting a security issue.