Zettai.net hosts my church’s web site. They do Plone hosting, and a good job of it too.
HOWEVER, they absolutely refuse to set up Mailman listserves for you. You can either use this weird dog listserv program that is ridiculously complex for a mailing program, or follow these simple-to-use directions for how to install Mailman from source and configure getmail and qmail to check a millon email accounts.
ANYWAYS, I was fine with their system of having you create 20 email accounts for each listserv you want to create, and having a script check each account every 5 minutes, but I found out when we re-upped that they only allow you to have a total of 100 email accounts now. So I can only have like 5-6 lists.
Well I have written Yet Another Program to try to make mailman work with their system. This program uses getmail, the “multi-drop” function, and the “delivered-to” header so that you only need two accounts per list: one for the list itself and a second for all the mailman aliases like mailman-owner.