mailman

Newsletter Integration For Mailman3 allows you to insert a customizable form into posts or pages, to subscribe to your Mailman 3 newsletter.

WP Mailster allows your users to be part of a group and communicate by email without having to log into a website.

Creates a simple contact form with a check box to subscribe to a mailman mailing list.

This plugin allows prospective customers to register on to a Mailman list.