Complete manual/405/en
From Gender and Tech Resources
Open: An open list allows anyone to subscribe, and then once they have joined the list, to receive announcements and/or participate in the discussion. Subscription can be automatic for those signing up, or it can require subscriber approval by a moderator. This type of mailing list is good for reaching out to potential allies, supporters, contributors, and followers to keep them updated about your activities. You can configure your list to be open when you create it in the list administration or configuration options.