free/open NNTP servers for comp.emacs.xemacs?

Greetings, I'm trying to move our comp.emacs.xemacs bi-directional mail-news gateway to sourceforge along with our other mailing lists. To do so I need an NNTP server that will allow access and posting from lists.sourceforge.net. The obvious first choice would be a news server run by SF's top-level network provider (exodus.net), but I wasn't able to find such a beast. The only other option I can think of is some kind of open and free NNTP service. Do such legitimate services exist, and are they fairly reliable? Any pointers would be appreciated. Thanks.