Mail-in-a-Box
An opinionated mail appliance for a supported clean Ubuntu host. DNS, certificates, mailboxes, and backups follow the appliance's layout rather than an arbitrary preexisting server configuration.
Start with the first guide, then choose a sending, receiving, or feedback task. Each walkthrough identifies permissions, operational checks, and the boundary between the service and MailKite. Refer to the official Mail-in-a-Box documentation for current platform requirements.
Explore the guides
Prepare a supported Mail-in-a-Box appliance host
Choose the supported clean operating system and DNS layout before running an installer that manages the complete mail appliance.
Configure Mail-in-a-Box users, aliases, and client access
Use appliance-managed accounts and DNS checks and distinguish mailbox identity from administrative access and alias routing.
Maintain Mail-in-a-Box backups and supported upgrades
Verify encrypted off-host recovery, preserve backup credentials, and avoid unsupported operating-system or component upgrades.