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Linda,

I also noticed that one person is listed as bouncing in red (the B is
in red). That's the first time I've seen that. Everyone else is in
blue. Is that significant?

Blue means that Groups.io is sending a bounce probe every few days, hoping to get the member unbounced. Red means that Groups.io has given up on the probes. In both cases ordinary group posts are no longer being sent to that address, and won't be until the member takes action to "unbounce" their account (email address). More details:
/g/GroupManagersForum/wiki/9674

We've been trying to figure out what the problem is, but I can't seem
to get any information.

You appear to be aware of the Email Delivery History tab of the member's page in the Members list. That tells you what the member's email service told Groups.io about its reasons for rejecting ("bouncing") the message. Some times the Reason text that goes with response code is clearcut; sometimes much less so.

In the less clear cases only that service can tell you what they really meant, but we can try to help you "read between the lines" of their text.

Shal


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