What software does DH use for the announce ML?

I’ve looked all over the wiki and the Dreamhost panel itself, but I can’t find mentioned anywhere what the software actually is that is used to run the announce mailing list. The discussion mailing list is mailman, but they won’t let you use that to run an announce list for some reason… is it some custom “in house” software or what?

The reason I ask is because I want to have an RSS feed of the mailing list posts, as some people might prefer that to traditional email. I can’t know if the software has that feature (although I suspect it doesn’t) until I know what the software IS.

There are a bunch of hacky solutions such as gmane, mailbucket, bloglines etc, but I kinda prefer something I can do myself and have control over.

Any ideas?