Been forwarded a load of someone else's emails

[northernladuk]

I can't see any reason an attacker would forward his everyday emails to a random person from his contact list.

Kid in his bedroom practicing and just pissing about? Who knows why hackers to the crap they do. Must be a mare for the poor chap just trying to get on with his business though.

[d000hg]

I received an email from a company I've bought things from before yesterday, the odd thing was it seemed to be just a copy of an order confirmation email from Amazon. Thought it was odd but ignored it. But over the day I got about 20 more, I didn't open them but they all look like real emails and appear to have the person's actual email signature attached.
The first one I did look at, all the links appeared genuine no spoof amazon.scam-you.co.uk or anything.

I messaged the guy - it's basically a 1-man thing selling art from his studio as I didn't want to email - and he's looking into it, no reason to think he's up to anything personally.

The obvious conclusion is he's been hacked somehow but I can't see any reason an attacker would forward his everyday emails to a random person from his contact list.

Anyone know anything about this sort of stuff?