Jeff Lefever founded indeed a Yahoo group. I subscribed to that group with only a few others IIRC. At that time there were Yahoo groups and Yahoo clubs. The Yahoo clubs were much more popular than the groups so later Jeff founded a Yahoo club called Classicappliances that turned into our home before Robert built the website.
Oddly enough, Yahoo decided to stop the Yahoo clubs activities and turned the excisting Yahoo clubs into groups. But by that time we already had moved to the website.
The classicappliances Yahoo group that was originally a Yahoo club still exists. See link. There is only little activity now and then.
The first Yahoo group doesn't exist anymore to my knowledge.