The Mailing Lists (lists) Plugin was designed to provide Geeklog native mailing list functionality. This web based tool provides all the features needed to support small mailing lists and is fully integrated with Geeklog.
Feature Summary:
Integrated with Geeklog including the geeklog moderation/submission API.
Allows mailing list owner's to specify the level of access a group of users can have: read, post or post+ (post without being subscribed).
User's have the ability to subscribe and unsubscribe themselves from all the lists they have access to.
Optional support for HTML email and list archives on a per list basis.