Mailman
From charlesreid1
Installation
You can download mailman from here: http://www.gnu.org/software/mailman/download.html
To verify the download using the signature, add the public keys of the developers listed on the download page, and visit Verifying a File using a Detached Signature at my GnuPG page for the verification process.
Pre-Configure Process
You must first create a username named "mailman" on your system.