Comment 5 for bug 558106

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Well, Mailman does a lot more than just keep track of who's subscribed --
for instance, restricted posters, list moderation, archiving.
LDAPMemberships is not meant to be useful for Internet mailing lists with
people signing up for them, but rather for institutional or enterprise lists.
These have a lot of the same requirements (moderation etc.) as Internet
lists, but don't need subscription/unsubscription -- since employees are
usually required to be on them.

My workplace is using this (well, actually a later version than the one I've
uploaded here) as a replacement for an LDAP mailing-list feature in
Netscape SuiteSpot now that we have migrated away from that system.
We -also- use LDAP-based aliases (in Postfix, not Sendmail, actually) --
but for some things we need the moderation and other facilities that
Mailman has.

For instance, we have an announcements list that goes to all regular
employees. A simple alias would allow anyone to send stuff to it, and
certain senior scientists would love to send big PDFs to everyone. A
Mailman list with LDAPMemberships can have sender restrictions so that
only our IT Director and our mail systems admin can approve posts to it.
Archiving is also quite useful for announcements lists.