Oddly, my travel group has 549 Yahoo Mail users. Only a half dozen were bouncing. Thanks for the heads up, Ruthie!
The message I see in Email Delivery History tab is:
This mailbox is disabled (554.30)
It seems one has been bouncing since March 1, 2019, a couple for just the last few days.
BTW, I am happy to have the search box at the top of the members so I could just find all the Yahoo ones quickly!
Frances
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/g/GroupManagersForum/wiki
/static/helpMore help: use the search button at the top of the Messages list.