John Goodell wrote:

Hello - I hope this is an appropriate place to post this question - will mailman 3 support multiple domain installations on one server? That is, currently a single mailman installation on a box can be setup to distribute to 1 domain name at a time - will we be able to run multiple domains on a single installation (on 1 server)?

Short answer, Yes.

I'm not sure if you fully understand the Mailman 2.1 situation. A standard Mailman 2.1 instance supports multiple domains. The only restriction is that the same list name cannot exist in more than one domain. I.e. list names must be unique within a single Mailman instance. Some installations live quite happily with that restriction; others can't live with it at all and resort to multiple instances or patches. That restriction will be removed in Mailman 3.