ZList is a simple yet powerful mailing list application and is built on Rails. It can send mail to an unlimited number of recipients, can be configured as announcement only or it can be fully interactive. Subscribers can view and reply entirely by email. All discussions are archived so you can go back anytime to see what was said.
It accepts emails HTTP POSTed to a particular URL. Postmark (postmarkapp.com) is what we use and is what's officially supported for incoming email. Postmark is also used for outgoing SMTP by default.
You can get the latest by downloading the master branch from GitHub, or you can grab the most recent tagged version on the downloads page at http://github.com/bensie/zlist/downloads
ZList currently runs on Rails 3.2.0 and requires Ruby 1.9.
Copyright (c) 2012 James Miller and David Hasson