This is free, open-source software used by organizations to manage electronic mailing lists and e-newsletters. It is written in Python and distributed under the GNU General Public License.
This is a newer tool designed to help users reach "Inbox Zero" by controlling when emails are delivered. Mailman Free Download
: The latest major update introduced a REST API, making it more modular and easier for developers to integrate into other applications. This is free, open-source software used by organizations