skxlist is a simple mailing list manager which is intended to be involved via (per-domain) aliases files.
It will allow users to subscribe, unsubscribe, and post to mailing lists which are hosted upon the local system.
When users submit requests to subscribe or unsubscribe they'll receive automatic replies, which may be customised, ensuring they confirm their actions and avoid spoofing.
Messages which are accepted are forwarded to each subscribed user via the invocation of /usr/lib/sendmail.
More details are included in the supplied README file.