listhelper is the name for a simple antispam system developed for GNU mailing lists managed by mailman. In short, it uses SpamAssassin, invoked via procmail, and a particular mailman configuration. The system is somewhat more fully described on a savannah page.
There are two mailing lists. First, [email protected], for general questions, discussion, bug reports, etc. The main system implementors (Bob Proulx and Karl Berry) are on this list. Second, [email protected], for volunteers willing to handle mailman pending queues for a variety of random GNU lists.
More information will be added here as needed.