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Last pushed: 2 years ago
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By @JoshData and contributors.

Mail-in-a-Box helps individuals take back control of their email by defining a one-click, easy-to-deploy SMTP+everything else server: a mail server in a box.

Please see for the project's website and setup guide!

I am trying to:

  • Make deploying a good mail server easy.
  • Promote decentralization, innovation, and privacy on the web.
  • Have automated, auditable, and idempotent configuration.
  • Not make a totally unhackable, NSA-proof server.
  • Not make something customizable by power users.

This setup is what has been powering my own personal email since September 2013.

The Box

Mail-in-a-Box turns a fresh Ubuntu 14.04 LTS 64-bit machine into a working mail server by installing and configuring various components.

It is a one-click email appliance (see the setup guide). There are no user-configurable setup options. It "just works".

The components installed are:

It also includes:

  • A control panel and API for adding/removing mail users, aliases, custom DNS records, etc. and detailed system monitoring.
  • Our own builds of postgrey and dovecot-lucene distributed via the Mail-in-a-Box PPA on Launchpad.

For more information on how Mail-in-a-Box handles your privacy, see the security details page.

The Security

See the security guide for more information about the box's security configuration (TLS, password storage, etc).

I sign the release tags on git. To verify that a tag is signed by me, you can perform the following steps:

# Download my PGP key.
$ curl -s | gpg --import
gpg: key C10BDD81: public key "Joshua Tauberer <>" imported

# Clone this repository.
$ git clone
$ cd mailinabox

# Verify the tag.
$ git verify-tag v0.10
gpg: Signature made ..... using RSA key ID C10BDD81
gpg: Good signature from "Joshua Tauberer <>"
gpg: WARNING: This key is not certified with a trusted signature!
gpg:          There is no indication that the signature belongs to the owner.
Primary key fingerprint: 5F4C 0E73 13CC D744 693B  2AEA B920 41F4 C10B DD81

The key ID and fingerprint above should match my key and the fingerprint I publish on my homepage.

The Acknowledgements

This project was inspired in part by the "NSA-proof your email in 2 hours" blog post by Drew Crawford, Sovereign by Alex Payne, and conversations with <a href="" target="_blank">@shevski</a>, <a href="" target="_blank">@konklone</a>, and <a href="" target="_blank">@GregElin</a>.

Mail-in-a-Box is similar to iRedMail and Modoboa.

The History

  • In 2007 I wrote a relatively popular Mozilla Thunderbird extension that added client-side SPF and DKIM checks to mail to warn users about possible phishing: add-on page, source.
  • In August 2013 I began Mail-in-a-Box by combining my own mail server configuration with the setup in "NSA-proof your email in 2 hours" and making the setup steps reproducible with bash scripts.
  • Mail-in-a-Box was a semifinalist in the 2014 Knight News Challenge, but it was not selected as a winner.
  • Mail-in-a-Box hit the front page of Hacker News in April 2014, September 2014, and May 2015.
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