Noel,
Our group is public, in that anyone can join and read messages.
I meant public in the stricter sense that anyone can read the messages, without joining. I don't know whether the DMCA (or a lawyer arguing about it) considers those effectively the same. Which is what I mean by having a field day with it.
But he also objected to transferring messages from other people that
included his messages as quotes.
In Groups.io there is an option not available in Yahoo Groups: the posted messages can be edited to remove the quoted material. But beyond a handful of messages that would be even more impractical than message deletion, without some form of automation.
Longstanding tradition in Yahoo Groups is that he's out of luck on that claim. But IANAL nor would I wouldn't presume to guess how Groups.io might handle it should a take-down be filed.
Another good reason for inline quoting, trimmed to relevant parts. That probably puts the quotes squarely in "fair use" territory (IANAL again).
Shal
Shal Farley