brent I'm of two minds as usual.
That's a large part of your charm, Brent.
It turns out that creating a mailing list in Thunderbird 102 is drop-dead easy, as are most tasks with that wonderful application. One just opens the address book and clicks to create a new list. Add one address per line, and give it a name, save it, and the list is in your address book just like any individual contact.
And it works wonderfully. When used as the address, CC, or BCC of a message, it sends a copy of that message to everyone on the list. And, of course, it supports text formatting, pictures, and attachments like any other emai from Thunderbird.
But, there's a but. But for some reason, using the name of the list as an email address does not work as an address in a message filter's "forward to" feature. It stops and asks for a valid email address. It's proably using a stadard regular expression to test for a valid email address, and that fails on a list name like "Family." It would need to expand that list into an email address line, but that functionality is missing.
So, I'm currently stuck, but not defeated. If I have to, I can manually forward any messages meant for the list to the list, but the idea of doing it automatically was SO attractive, and so easy to set up. All but the "doesn't work" part.
As I wrote, I'm not yet defeated. There are a large number of add-ons for Thunderbird, just as there are for Firefox. It's possible that one of those does just what I need. And there's a forum for Thunderbird, just as there is for Solus. I'm a member. I haven't tried there yet, but that's next.