It's possible to get the subscriber list by sending mail to the mailing list
server. It's also possible to get people's addresses from the mailing
list archives on www.grot.com.
The Zoomer Upgrade folks did try to send their announcement to the mailing
list, but used a very old address -- zoomer-list@grot.starconn.com -- and
so it didn't work. I sent mail asking for details about the upgrade.
If I hear back from them, I'll ask about the email stuff.