Ghost additional email address when replying

Adrian P 0 Reputation points
2026-08-28T19:52:46.9833333+00:00

When I reply to an email from one specific person (with a hotmail address), there is an additional recipient that does not show up on the CC or BCC that the email goes to. Not that I get a reply - as I get a delivery failure, telling me the person's mailbox is full.
Anybody got any ideas what is happening here?

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