Just to close the loop on this, appended below is some feedback from Mark. I believe this may explain much of what folks have reported today, but not all.
Anyway, glad to hear that things seem to be proceeding as expected for most of you again.
FYI,
Bruce
Mark Fletcher?(Groups.io)
Nov 27, 15:03 MST
Bruce
I think the issue was a delay from the time that we accepted the invite to join the Yahoo Group till the time that we sent the message telling them we've accepted the invite. Someone else accepts the invites, and I send the messages, so sometimes there can be a delay of up to 12 hours between that.
Hope this helps.
Mark