Seems to be in the process of recovering and sending out old mails right now.
In any case, given the unreliability of SourceForge, I think we should stop promoting the list (as well as the libopenmpt security mailing list). We can still leave both running as is for the foreseeable future.
Any objections?
Especially for the libopenmpt security announcement list, the unreliable mail transfer of SourceForge is in fact a huge problem, as it might prevent people from seeing the necessary announcements. Our RSS feeds have no such problems, because in case of service unavailability, RSS subscribers could at least get notified by the RSS reader software.