a) filters spam very well b) allows the list to be hosted using our domain name, not yours
We meet both of those requirement. Just keep in mind that since you cannot have a domain point to two servers (Mailman requires a web server), you will need to use a domain name that is not in current use or you can use a sub-domain off of your main domain such as list.open-mesh.net.
We currently have about 100 message/month in traffic. Does this describe your $4/month service?
How many members will be subscribed to your list?
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This is the best alternative that I have found. They charge $4/month for up to 1000 subscribers and 1-8 posts/day.
I would read the small print. We currently have 100 messages/month to a closed list. Once it is an open list, and well publicised, the amount of spam will increase dramatically. I personally get 100-200 spams per day. Does this 1-8 posts per day include or exclude spam?
However, thanks for doing a good job so far.
Andrew