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I sent a message to one of my groups and strangely received 2 "Delivery Failure” email notices from my Email Provider <Postmaster@...>

| Message delivery failed to the following address <snipped>@mail2world.com Reason: Mailbox deactivated
These "Delivery Failure" emails included the full message text including footer that was successfully received by other members of my Groups.io group

Both were for < @mail2world.com> email addresses that were members of my YahooGroups, but seem not to have been moved over to Groups.io
I can not find any record of those email addresses or those message failures anywhere on my Groups.io group

The Moderator Activity log does not show any "Support added < @mail2world.com>” entries as it does for the addresses that were moved.

What happened?
Where would this be logged?

I sent a message to one of my groups and strangely received 2 "Delivery Failure” email notices

Perhaps these notices were from mail2world.com, not comcast.

Those messages were auto-forwarded to mail2world.com, some members of the .io group have set up forwarding. Probably you can see these members' email addresses in the header or footer included in the Delivery Failure notices. Unsub or ban them.