On 6/11/20 11:12, Brian Carpenter wrote:
> The reason for the bounce will be contained in the outgoing SMTP logs. 
> If you don't have root access then you may need to ask your hosting 
> provider to look into it. 

Thanks for the idea. I do indeed not have root access, as it is a shared 
server, but I do have a shell access. The server is configured to use qmail, I 
was not able to find its outgoing SMTP log in any of my userspaces (I'm new to 
all this). However, I did find mailman/logs/smtp.log. This looks clean though. 
So the mail has not bounced directly when sending but later down the line. I 
guess I have mostly to fight against "backscatter" as Dimitri called it. I 
highly suspect a misconfiguration at the user's end, maybe even in the MUA, who 
knows.

I'll follow Marks idea to reconfigure qmail to forward the bounces to me. That 
should work well enough.

Thanks again
Florian.
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