Y!ahoo groups are dead now, (((shoah'd))) by Yahoo. You can still kinda use it but no one can post anything nor moderate anything. We did create a Y! archive.
So unsubscribe yourself from Yahoo since it's not even a usable service anymore. Funny a while back the same thing happened to Geocities blog. Something like 3.92GB of data for all of Geocities. Why would yahoo shutdown it's blog site services even if outdated that's still historical internet information. What can't keep less than 4GB available, does Geocities even use up any bandwidth at all. Hell I bet people probably visited yahoo sites more with these services available than they do now, even IF at one point Yahoo was a big contender of internet search engines.
Anyways external A-Forums are what we use now. So stick with A-forums.