Undelivered Mail Returned to Sender

On one of my ISPConfig servers the Mail Queue gets floated with bounced mails.

The mails look like they were send from my server an bounced back to me, always from user uucp. How can I fix this? Create a mail alias uupc to /dev/null

Something like this:
<uucp@domain>: maildir delivery failed: create maildir file
/var/spool/uucp/Maildir/tmp/1194459537.P25680.host:
Permission denied

 

I'd create an alias in /etc/aliases and forward the mails to some other user or /dev/null. Don't forget to run

Code:

newaliases

and restart Postfix after you've changed /etc/aliases.