Mm-handler works well when mail-lists are in a separate domain.
I ran across postfix-to-mailman.py while researching mailman to postfix connections. I realized it performs the same function as mm-handler. I changed mm-handler to be a drop in as a replacement for postfix-to-mailman.py <https://github.com/fauria/docker-mailman/blob/master/centos7/postfix-to-mail...>. It is under:
http://sw.ziobro.info/mm-handler/
I did a test install of mailman with Postfix to test it. It worked.
I also setup a Mailman to Postfix connection using the aliases method as described in the documentation. That worked fine also. I don't use Postfix but using the postfix-to-mailman.py seemed a little more obvious than setting up through the aliases method. The Postfix package on CentOS 7 even had comments where the mailman transport entry would go. Configuring is especially tough if you are not familiar with Python. :-)
Setting up mailing lists in a separate domain has a nice administrative appeal. I did a little more research to see how popular that method might be. I got a list of 1922 US universities and 457 have a host "lists...." and 191 have a host "list..." in their DNS. I surveyed a few and ran across: Mailman, Lyris, Sympa, Listserv, Majordomo, and Google groups. Many universities outsource their Email to Outlook which has it own Group capability.
Running mail list software is clearly popular. Both mm-handler and postfix-to-mailman.py are contributed code. The folks who package the various tools add glue to make them easy to use. It looks like both Sympa <https://sympa-community.github.io/manual/>and Mailman have very similar requirements. Maybe time to work together?
I can hook up any mail system. Just give me the list of mail-lists and tell me how to inject messages. Glue will be more specific to a Mailer and OS than either Mailman or Sympa. I think we get a benefit if we make a clean interface between Mailman and its feeding MTA. We can then eliminate some of the hacks like mm-handler.
I have some ideas for Mailman2. I'll follow up.
Ciao, //Z\\ Jim Ziobro