Overview

Mail-in-a-Box is a one-click, self-contained email server designed to give individuals full control over their own email. It turns a single fresh Ubuntu machine into a complete mail server with SMTP, IMAP, a modern webmail interface, automatic SPF/DKIM/DMARC records, DNS management and automatic TLS certificates.

Key Features

• One-Click Setup: a single installation script turns a fresh Ubuntu box into a mail server
• Integrated Webmail: bundled modern webmail interface for reading and sending mail
• Automatic DNS: SPF, DKIM and DMARC records set up automatically
• Automatic TLS: free certificates issued and renewed via Let’s Encrypt
• Spam Filtering: built-in filter with greylisting, SpamAssassin and automatic blacklist updates
• Backup & Restore: automated encrypted backups of the whole mail system

Why Use It

Mail-in-a-Box is aimed at people who want to stop relying on third-party email providers and run their own infrastructure simply. Its opinionated, fully-automated design means you get a hardened, up-to-date mail server without assembling dozens of components yourself.

Use Cases

• Running your own personal or small-organisation email domain
• Taking control of your email data and avoiding third-party scanning
• Learning how a full mail stack fits together

Platforms

Ubuntu (a dedicated machine or VPS), with webmail accessible from any browser.

Licence

Open Source — CC0-1.0 (public domain dedication for the codebase).

Website

https://mailinabox.email/

Alternatives

• Mailcow — dockerised all-in-one mail server suite