Listeron is described as 'An email address for your group. Discuss. Debate. Organise. All with email. This is the most simple way to make a regular mail discussion list or "Listserv." Very commonsense and easy. Free version or an inexpensive paid version'. There are more than 10 alternatives to Listeron, not only websites but also apps for a variety of platforms, including Mac, Android, iPhone and Linux. The best alternative is Basecamp, which is free. Other great sites and apps similar to Listeron are Google Groups (Free), Mailman (Free, Open Source), Fleep (Freemium) and winio (Freemium).
Dada Mail is a contemporary mailing list manager, enabling you to easily run a verified mailing list that your subscribers can trust - right on your own website! Make running your business and personal mailing lists easy, fun, and inexpensive.
Allows you to run a free Listserv or email group right from your WordPress dashboard. Its the best two-way communication group email plugin in wordpress where an email sent to the main group email gets forwarded to the all group members.