Very easy to use and quick to setup. I have used it personally.
Mailman 3 - Dedicated Mailman 3 installation. Unlimited lists/configuration. Free subdomain at mailman3.com. Dedicated support for list admins.
Vidpopup - Are you tired of the same old contact technique on your website?
MailChimp - MailChimp is the best way to design, send, and share email newsletters.
VideoAsk - Typeform's VideoAsk is now available on your web browser
Mailman - Mailman is free software for managing electronic mail discussion and e-newsletter lists.
Google Groups - Google Groups allows you to create and participate in online forums and email-based groups with a rich experience for community conversations.