Don,
I have a Wittman Tailwind as well. It is currently not airworthy, perhaps flying by Oshkosh time. ( Got to make Leonard's 90th)
I was used to doing it that way too... Yahoo has screwed with their email, and if you ask me --screwed with and ruined their groups.
I still belong to several groups and have the email filters set to sort them to their own folder. Most have gone pretty much flat.
I found out that setting yahoo mail to https fixes it from being rejected by email servers all over the world. (with the normal http: it is behaving like spam... too many hops)
So we are not looking back. We are forging ahead.
It is going to be an adjustment, but we have some semblance of control over our own destiny now.
Everyone should speak up when they see something wrong, or something that maybe could be better... We will get there together.
Onward and upward.