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Chris,

I'm not going to say that it /isn't/ correct but it doesn't accord
with my / our experience.

What I said was correct, but you're right - it wasn't the whole story. Rather than try to tell the whole story I cited GMF's wiki page on the subject.

The group I moderate has just over 2900 "members"; the bouncing list
has about 650 entries, with the vast majority identified as bouncing
on the day we migrated from Yahoo.

As Bruce mentioned, many of those may have been set to No Email or Special Notice and not detectable as "bouncing". But it is also true that Yahoo Groups' bounce tracking mechanism has been unreliable for some years now.

So you'll have some false negatives transferred to your Groups.io group - and promptly detected as bouncing.

There may also be false positives in there - Y!Group members with perfectly functional email addresses, but who did not transfer over because Yahoo had them on bouncing status. These are probably far fewer in number, but one never knows. The easiest way I know of to find out is to Invite or Direct Add them and see what happens.

Yet another possibility are addresses that accept messages from Yahoo Groups, but not from Groups.io and end up bouncing here. This can happen if the service has very tight anti-spam filters, or allows their users to select things like requiring senders to "prove themselves human" before their messages are accepted. The user, or the service, may have "whitelisted" Yahoo Groups as a sender.

Another oddity is that some addresses seem to be "cut off"
immediately, while others have a whole string of bounced messages
recorded before the sending process is suspended.

It depends on the service and their rejection code for the bounced messages - Groups.io does its best to preserve communication for cases where acceptance seems erratic or might be restored after a few days.

... but I'm not sure that messages get the same treatment. ISTR
finding posts from people who were no longer members with their names
still shown.

Messages are a little different. They will still show the original posting member, but they aren't "owned" by that (now) non-member. That is, in my experience you can't find them via "All Posts By This Member" or similar means.

Shal


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