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Undelivered email to wrong address

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Spam senders use lists of emails not only for recipients, but also for senders.
Seems your friend's address got abused as a fake sender address, and then undelivered spam comes "bouncing back".

It is actually possible to double check if the spam originated from his ip address.

In the bounced emails, you usually have a copy of the bounced email attached. If you open such an attachment in notepad and look at the delivery headers, then you can see which way the spam was delivered. If the ip addresses listed have nothing in common with your friends email server and/or own public ip, then his address was simply used as a fake sender.