GNU Mailman -- the world's most popular mailing-list manager -- has been in constant revision for two decades and supports more than 20 languages.
MailmanLists hosts group mailing-lists -- using GNU Mailman -- on servers around the world, and provides customer support 24 hours a day, 7 days a week.
Our servers are currently running GNU Mailman versions 2.1.39 and 3.3.9.