courier-mlm 0.53.3-2ubuntu1 (amd64 binary) in ubuntu feisty

 The couriermlm command sets up, maintains, and runs a mailing list.
 couriermlm automatically handles subscribe and unsubscribe requests,
 and removes undeliverable addresses from the subscription rolls.
 Mailing lists managed by couriermlm require zero human administrative
 oversight. couriermlm supports digests, write-only posting aliases,
 and moderated mailing lists.