Mailman - The GNU Mailing List Management System

This is GNU Mailman, a mailing list management system distributed under the terms of the GNU General Public License (GPL) version 3 or later.

Mailman is written in Python, a free object-oriented programming language. Python is available for all platforms that Mailman is supported on, which includes GNU/Linux and most other Unix-like operating systems (e.g. Solaris, *BSD, MacOSX, etc.). Mailman is not supported on Windows, although web and mail clients on any platform should be able to interact with Mailman just fine.

Learn more about GNU Mailman in the Getting Started documentation.


The name of this software is spelled Mailman with a leading capital M but with a lower case second m. Any other spelling is incorrect. Its full name is GNU Mailman but is often referred colloquially as Mailman.


Mailman was originally developed by John Viega. Subsequent development (through version 1.0b3) was by Ken Manheimer. Further work towards the 1.0 final release was a group effort, with the core contributors being: Barry Warsaw, Ken Manheimer, Scott Cotton, Harald Meland, and John Viega. Version 1.0 and beyond have been primarily maintained by Barry Warsaw with contributions from many; see the ACKNOWLEDGMENTS file for details. Jeremy Hylton helped considerably with the Pipermail code in Mailman 2.0. Mailman 2.1 is primarily maintained by Mark Sapiro, with previous help by Tokio Kikuchi. Barry Warsaw is the lead developer on Mailman 3.


The Mailman home page is:

with mirrors at:

The community driven wiki (including the FAQ) is at:

Other help resources, such as on-line documentation, links to the mailing lists and archives, etc., are available at:

Bits and pieces

Mailman 3 is really a suite of 5 projects:

  • Core - the core message processing and delivery system, exposing a REST API for administrative control. Requires Python 3.4 or newer.
  • Postorius - the new web user interfaces built on Django.
  • HyperKitty - the new archiver, also built on Django.
  • mailman.client - a Python binding to the core’s REST API. Compatible with both Python 2 and Python 3.
  • Bundler - a convenient installer.